Dart rear tires

I just put a pair of 275/60/15 MT ET Street Radials on my '69 Dart GT on 15x8 Weld wheels. The rear is a stock length 8-3/4" rear with big bolt pattern axles. The stock wheel well barely accomodates these tires, but only with some modifications. FIrst, the outer lip is rolled. In addition, the leaf springs are moved in slightly with the offset front and rear hangers. The location of the rear spring in the front hanger is in the lowest hole of the front hanger. I don't have a drive train in the car, so the fit isn't quite final yet. Worse case, I may end up mini-tubing the car.