275-60-R15 is a big tire with 8.5 inch wheels. They could rub the inner fender. Adjust Your panhard bar to center the wheels. I used air shocks or load leveler shocks with springs to raise the back. 255 is a better size. The 69 B body has less clearence than a 68 wheel well. Of course if You already ordered the tires try them. NICK L72