Biggest rear tire in a 68 Dart?

I'd be interested to know how much backspacing you can use on the front with a 15" steel wheel before you run into clearence problems with the suspension. My 14" wheels with 4" backspacing hit the outer edge of the upper control arms on my '64 Barracuda. I'd think that it might even be a problem with 15" aluminum rims, since they're thicker than steel rims. I'm hoping to eliminate that problem by using 15" steel wheels. Either black or body color, not sure which yet. I've already got the dog dishes. :supz:

Just for general info, I talked to Stockton Wheel yesterday about wheels. They said $135 for stock type steel wheels, 15 x 7, custom offset, sbp, if I supply the wheel centers. My first set of "Mags" cost me $120. Now I gotta pay more than that for 1 steel wheel! Geeeez. :sad5:


:burnout: