I already have a 4th gen rear end under my 91 RS, which is 3" wider than stock I believe. I just picked up some 17×11 ZR1 rims on an F body offset. The tires are 315/35/17 drag radials and im concerned about the tires rubbing the fender lips(haven't mocked up yet). Will I have to roll the fender lips? Also what springs are better to go with for this situation? I plan on going with KYB Excel-G for the rear shocks.