suspension upgrades?

actually a early 70s mopar stock car is VERY comparable, because they used factory unibodys, and the same torsion bar/leaf spring design as the street cars. Back in those days, they were much different from today

You aren't really trying to tell me that a NASCAR suspension is like a street car suspension? Other than basic design. I have too much respect for them. The roll cages tying everything together, the adjustability, the spring rates, attention to detail, and the ability to run 200+ mph.