7 1/4 rear ends routinely broke with 13 inch wheels. So there's that.i was just hoping , i have some adapters to large bolt, i was thinking of using police car wheels (15x7 inch) , but i am wondering if my 71/4 rear end can take it, i have a 318 in the valiant (i've had it in the car for 20 years) ...if i take it easy...maybe...........what do you think?, my 1964 valiant convertible was in a 1998 Kit Kat candy commercial (you tube ...route 66/kit kit) that we filmed in flagstaff,arizona.....