Here's a set of "new" SS springs that were NOT heavy enough. When the car would launch it felt like it was going to roll over on the right door. I ended up adding a extra leaf to the right side. (took the 2nd leaf from the old SS spring and made it the 3rd leaf on new set). The car sits with the RR higher than the left, but it launchs fairly level. 11.5MT's, 4:56 Dana, no snubber, 3200 lbs, Calvert front shocks, 6 cyl torsion bars.
I'm pleased with mine.
Brian