Duster suspension set up questions
In the back you shouldn't have any issues with tucking the tops of the tires into the wheel wells. On my Duster the 295/40/18's I run are 27.3" tall, I run roughly stock height springs and use a spring slider set up that lowered the rear about 3/8". And that set up puts the top of the tire slightly above the quarter lip. It's ~26" to the quarter lip from the ground on my car so even with the weight of the car on the tires they're still tucked in a little. Also, if you're running a 1/2" offset kit and trimmed the quarter lip back you should be able to run 295's if you wanted as long as you get the backspace on the wheels right on.
In the front you're going to have a LOT of work to do, especially if your front tire is only 25" tall. You'd have to lower the front of the car about 2" to get close and honestly even that wouldn't be enough to cover the tops of the tires with only a 25" tall front tire. I run my Duster at just under 25" from the fender opening to the ground, and run 25.6" tall front tires, and they're barely covered because the tires just aren't as tall as the spec when the weight of the car is on them.
If you compare to the factory ride height specs, your A-B has to be 0 where the factory calls for it to be 1 7/8". That's a substantial loss of suspension travel, which isn't good at all for the street. You can get about 1" back by running short lower bump stops, the factory stops are 1 3/8" tall so if you replace those with 3/8" tall bump stops you regain about an 1". On my car, I run QA1 tubular LCA's. The original style that didn't have bump stops had a lower profile than the stock LCA's, resulting in a gain of about 1" of travel. So on my car with 3/8" bump stops and the QA1 LCA's I kept about the same amount of suspension travel as stock.
I run 1.12" torsion bars in the front. Even with a 300 lb/in wheel rate I still occasionally touch the bump stops with street use. It's not enough to be a problem but you couldn't skimp much on the torsion bars without bottoming the suspension quite a bit more in my opinion. Obviously that depends on how you drive the car, I drive in a pretty spirited fashion on some not particularly well maintained mountain roads, so, if you're just cruising around town on the weekends you could get away with smaller bars. Bars that large aren't going to be ideal for drag racing though. You will have an advantage there because your 6.4 Hemi is likely quite a bit lighter than my iron headed 340, so you could probably run something like the 1.08" bars that @BergmanAutoCraft offers between the lighter front end and the difference in driving duties and still be in the ball park for wheel rate. Again, not great for a drag race set up in the front but it will handle and ride better than just lowering it onto the bump stops with the factory bars.
For shocks I've run Hotchkis Fox's and Bilstein RCD's, they work well with the large torsion bars. But they're probably not what you want for the strip.
I mean he's asking about a street/strip set up, which is no doubt closer to what you've built than what I have. Why not offer help instead of snide comments?
In the back you shouldn't have any issues with tucking the tops of the tires into the wheel wells. On my Duster the 295/40/18's I run are 27.3" tall, I run roughly stock height springs and use a spring slider set up that lowered the rear about 3/8". And that set up puts the top of the tire slightly above the quarter lip. It's ~26" to the quarter lip from the ground on my car so even with the weight of the car on the tires they're still tucked in a little. Also, if you're running a 1/2" offset kit and trimmed the quarter lip back you should be able to run 295's if you wanted as long as you get the backspace on the wheels right on.
In the front you're going to have a LOT of work to do, especially if your front tire is only 25" tall. You'd have to lower the front of the car about 2" to get close and honestly even that wouldn't be enough to cover the tops of the tires with only a 25" tall front tire. I run my Duster at just under 25" from the fender opening to the ground, and run 25.6" tall front tires, and they're barely covered because the tires just aren't as tall as the spec when the weight of the car is on them.
If you compare to the factory ride height specs, your A-B has to be 0 where the factory calls for it to be 1 7/8". That's a substantial loss of suspension travel, which isn't good at all for the street. You can get about 1" back by running short lower bump stops, the factory stops are 1 3/8" tall so if you replace those with 3/8" tall bump stops you regain about an 1". On my car, I run QA1 tubular LCA's. The original style that didn't have bump stops had a lower profile than the stock LCA's, resulting in a gain of about 1" of travel. So on my car with 3/8" bump stops and the QA1 LCA's I kept about the same amount of suspension travel as stock.
I run 1.12" torsion bars in the front. Even with a 300 lb/in wheel rate I still occasionally touch the bump stops with street use. It's not enough to be a problem but you couldn't skimp much on the torsion bars without bottoming the suspension quite a bit more in my opinion. Obviously that depends on how you drive the car, I drive in a pretty spirited fashion on some not particularly well maintained mountain roads, so, if you're just cruising around town on the weekends you could get away with smaller bars. Bars that large aren't going to be ideal for drag racing though. You will have an advantage there because your 6.4 Hemi is likely quite a bit lighter than my iron headed 340, so you could probably run something like the 1.08" bars that @BergmanAutoCraft offers between the lighter front end and the difference in driving duties and still be in the ball park for wheel rate. Again, not great for a drag race set up in the front but it will handle and ride better than just lowering it onto the bump stops with the factory bars.
For shocks I've run Hotchkis Fox's and Bilstein RCD's, they work well with the large torsion bars. But they're probably not what you want for the strip.
I mean he's asking about a street/strip set up, which is no doubt closer to what you've built than what I have. Why not offer help instead of snide comments?