How much difference will it make?
As far as a rear sway bar with uneven SS springs. I would not use one. Our new car will have Calvert mono leafs and will have "roll control" same as sway bar. But in the past I had SS springs with a sway bar and could never get it to hook. Also when using the 002 003 springs put the car on a jack under the center in the rear when leveling the front torsion bars with stabilizer link removed. When you leave the rear down the car will lean. This is how our car worked the best.
You can see in the picture below the car had SS springs by the uneven shock length from the spring packs. Also the sway bar. It did not like this sway bar at all when the front was set as per the instructions with the springs that you don't get with the springs today.
Here is a video below also . The car has ss springs without the bar. The front is leveled while on a jack in the center of the rear so it leaned when set down. slant six bars and we put extensions on the upper control arm bump stops to reduce suspension travel to keep the wheels down. 90 -10 shocks The car was all steel , full interior and the spare and jack in the trunk. went low to mid 10's.
As far as a rear sway bar with uneven SS springs. I would not use one. Our new car will have Calvert mono leafs and will have "roll control" same as sway bar. But in the past I had SS springs with a sway bar and could never get it to hook. Also when using the 002 003 springs put the car on a jack under the center in the rear when leveling the front torsion bars with stabilizer link removed. When you leave the rear down the car will lean. This is how our car worked the best.
You can see in the picture below the car had SS springs by the uneven shock length from the spring packs. Also the sway bar. It did not like this sway bar at all when the front was set as per the instructions with the springs that you don't get with the springs today.
Here is a video below also . The car has ss springs without the bar. The front is leveled while on a jack in the center of the rear so it leaned when set down. slant six bars and we put extensions on the upper control arm bump stops to reduce suspension travel to keep the wheels down. 90 -10 shocks The car was all steel , full interior and the spare and jack in the trunk. went low to mid 10's.