Will they fit my 64 Dart GT?

I have just found a set of 15x7 4.25 or 4.5 backspace small bolt pattern rally wheels in incredible condition. They have P195 65r 15s 89S. Firestone affinity tires. Does anyone know if these will bolt on to my 1964 Dart GT Conv. There appears to be ample room with those tiny 13s it now has. It's in the upholstery shop, and I can't get at it to confirm. The wheels came of a 71 duster with drum brakes. They look good, but I am concerned with clearance on the fron wheels. Many guys put 14s on front and 15s on back, and I'm hoping to avoid that. Any insight out there?
h2ojoe