I just picked up some 15x8 draglites for dirt cheap for the rear of the car. What backspacing is normally run on these wheels? The wheels I bought are 4.5 inches of backspace and the rim looks like it sits nearly flush with the out fender well. Is this the correct backspacing? What size tires do you suggest? I dont want to have a redneck looking tire sticking out past the fenderwell..BTW the car is not lowered.