When I did my '68 Dart I kept it pretty simple. Rebuilt the front end with poly bushings (also swapped to big disc brakes), .90 t bars (great for improved street driving), and Koni shocks. Added a factory front sway bay with poly bushings (tried 3 different aftermarket bars, but never liked how they fit). I the rear, I kept the leafs (got them rearched at the truck repair place), rebuilt with poly bushings. Koni shocks again, and an aftermarket 7/8" sway bar (which was actually a little larger than the front, not reccomended!). I also swapped in 11" x 2 1/2" drums from a C body. Got the manual box fixed up, though I wanted a faster ratio. With 225/50/15 Summitomo tires on cop car rims and a G - Force meter, I was able to pull a .97 g average. Ma Mopar did the homework and got the suspension right the first time!