On my '73 Barracuda I am modifing the outer wheel house so that my tires will stop rubbing. If you examine the outer wheel house it does not follow the quarter panel up, it goes up and in at a much shallower angle. My tires have always rubbed on a big bump so I couldn't lower the ride height at the back of the car. I have cut out the offending area and I will replace it with something that looks like a section of a wheel tub.