Will a 15" wheel fit on my 63 Dart

I believe that the factory backspacing was 3.375" but I have a 66 dart and run a 15x7 on back and 14x7 up front with the 4.125 backspace and they fit great. I also use a P235/60R15 for back and a P215/60R14 for front with no rubbing problems. I am actually selling my rallys that are only about a year and a half old and look great because i just got cragars. let me know if you are interested. Hope I helped. -Kory