[RedEye]

Not sure if it's worth mentioning considering the custom nature of these cars, but I have a StreetBeast (rather heavy with the thick fiberglass and my custom cage, around 2600LB wet), and I started with 525/375 springs front/back and am now running 475s in the back. Ride is not too harsh, and it as helped me correctly position the rear wheels into the fenders and limit the fiberglass rubbing. I've heard of some guys having much stronger springs, might be worth a calculation.