I've got 295/55/15 tires on the back of my '68. They'll rub a little if I take a corner too fast. be careful to measure the backspacing carefully (offhand, I don't remember what it was on my Road Runner).

"When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson