Looking to go from Rallye 14X6 to Cragar SS - 1973 Dart Sport 340

15x8 with 4.25 out back is really nice on your car. A 245/60/15 fits really nice. You would have to go smaller up front and can stick to that 14x6 if you want too 205/70/14 is very common, although a 15 would be a little better