I did this with my Challenger back in 08. Took them to a semi spring shop nearby. They told me to measure the car as it sat with sagging stock springs. Then lift the body up to where I want it to sit with re-arched springs. I came up with a 4" difference. They added a leaf or two (can't remember now) and re-arched them and the car sat EXACTLY where I measured it. 8 years later I haven't had the first problem.

Now, I will say this, the car is pretty firm in the rear with the re-arched shocks but maybe I went much further than the average person. But hey, when you're fresh out of college money is hard to come by, and that $100 re-arch looked a lot better than $300 SS springs.

However, my car launched like a freakin dream at the track with this setup! Squatted down and went straight as an arrow and bit hard with my tiny 26" tires on it.