Scaling a stock suspension car.

I bought the cheapest proform wired ones, from jegs with there discount it was around 750. Rear leaf springs are homoligation of a couple different ones, could definitely be part of the problem.
If you think about new sprAngs, I would not get the MP SS sprAngs. Call Mancini and actually TALK to them. Tell them what you have and that you don't want the MP springs, but some of their sprAngs. They will fix you up. I say that because the MP sprAngs are made in Mexico and the metallurgy is not consistent at all.