Frame or chassis options for A bodies

Honestly, I wouldn't get anything from magnumforce ever after seeing one of their other previous tubular k-frames that had an unsupported rear lower control arm mount actually broke on I believe more than one car while they were backing up,

The next question you need to ask is if they actually strength test any of this stuff before they send it out. It's a friggin k-frame and lower control arms. If it busts, you're in a world of hurt. I've never even seen it mentioned so who knows.

Then you need to ask if they tune the suspensions with their aftermarket k-frame at all using any scientific equipment. Chances are that answer is no.

Do they actually race their own cars in autocross or anything like that? I doubt it.

I think the magnumforce system is for show poodles and drag cars at best.

Since you are planning a small block - they make headers that fit well in the car, so that's no issue whatsoever.

Between Hotchkis and Bergman Auto Craft, you can buy pretty much everything to make your car handle on rails AND have good steering feel. The Borgeson steering box is a great piece, the car feels very tight now.

Hotchkis actually strength tests everything and does research on shakers, autocrosses their own cars, etc to tune it to the best it can be. Bergman Auto Craft also does a lot of testing on his own car and can do a great job recommending parts for you as well. He is a member here, GMachineDartGT.

I am not sure why you think you need adjustable lower control arms. The uppers are.

A good place to start is really the Hotchkis TVS, some 1.06 Firm Feel Torsion bars, the Fox/Hotchkis adjustable shocks, and the borgeson steering box.

I can adjust caster/camber/toe no problem on mine, everything is rod end except the LCA bushing and I am still running stock inner/outer tie rods, which are fine. I have +7 caster, -1 camber, and 1/16" per side toe and lots of room for more.

Additionally, I think these coil over kits may restrict the amount of rubber you can fit under the front of the car. 72blunblu and I both have 275-35-18's. And so did Tomswheels.

You also need to know that Tomswheels' car had about 250hp and an A-833 OD that doesn't have great gear splits and ran with Mary Pozzi's camaro as was mentioned which is like a 500hp, easily 75k car.