You'd better have an adjustable panhard bar too. Some barely rub with 275's as mentioned. The 315's looked awesome on my SS but I had to massage the heck out of the inner wheel wells (Convertible - so yours may not be as bad), adjust the panhard just right, put spacers on the wheels and then they would hit the fender going over bumps (But the car is lowered 1 1/2" or so). So then I extended the bumpstops down to keep the tire off the fender. It looked great. They still would rub under hard cornering. The ride was harsh going over bumps. But they did fit. When I punched a hole in one on the interstate, I bought 275's again.