'64 Dart Cragar S/S Size & Back-spacing

I'm looking to pick up a set of used S.B.P. Cragar S/S's for my '64 Dart but I'm not sure what size fits best. The car has stock drums front & back. I've run across a set that has "reverse" backspacing which I think will make them rub on the outer wheel well, is this correct? Does anyone have a set on an early Dart with drums? If so what are the spec's. I've also found a set of 14x7's with a 3.5" backspacing. I spent the past few hours looking at old posts in the "early A" and "wheel and tire" forums and haven't run across any that specifically adress this question. Any help would be greatly appreciated. Also, if you have a good set that will work, let me know...

Best way to stay safe is with the 15X6 Cragers. If you go with 15X7's you'll have tire clearance problems. You could have a set widened and sectioned to a get a 4.5" backspace