Re: max wheel/tire size for a 64 magnum 500
Four inch or less backspacing on the front to clear the control arms/ball joint. Three and three quarters works. Four and a half on rear. That's what I'm using with 11 inch rotors. I'm running 235/60/15 on the rear and they do rub the enter fender on bad bumps sometimes. Newer springs would probably solve that problem.
"Tell it like it is or don't tell it at all" 1964 Falcon 2dr HT, 347V8 4V, dual exhaust, 5sp, pwr assist R&P steering, AM radio, heater with defrost and 2sp fan, electric windshield wipers, cigar lighter, dlx light group, bucket seats, console and full carpet.