knuts, sounds like you have a little too much back spacing. You could roll the inner edge of the fender lip to alleviate the rubbing problem. I would recommend lining the top edge of the fender well opening with masking tape, get a wooden baseball bat, slide it in, angled between the top of the tire and the wheel well, have someone sit on the rear quarter, while someone drives the car forward slowly, rolling the bat along the inside of the fender well, thus rolling the inner edge up. Repeat until you get the desired clearance. Problem solved!