Yeah it's pretty much stock setup. And good point about the springs and shocks they could be wore out. The plan is mostly street, occasionally strip. Around 300 hp.
If 300hp is doing that kind of stuff with your spring they're shot. Springs, bushings, shocks, probably all need to be replaced.
ESPO is a good source for rear leaf springs, you can spend a bunch more for Hotchkis, Firm Feel etc, but if the car is primarily just a street driver a nice set of XHD springs from ESPO should work great.
The other thing is, you said you just put bigger rims and tires on. How big? What size tires are on there, and do you have the specs for the rims? Because if you went too big with the tires, or missed the proper specs on the rims then even a new set of springs might not help the tire rubbing issues.
