I've read through most of the postings in this forum, and it seems many prefer 15" over 14" for early Barracudas. For the most part the car is being restored to original specs, but I don't care for the factory wheels and caps. I'm planning on buying new Rallye wheels, sombrero caps and trim rings, because I really like the look. I want the same size on all four corners, and the suspension is stock Formula S, small bolt pattern, with KH factory discs up front. What are the advantages of 15" over 14"? What backspacing is needed? Best overall tire size? Do not want to do any mods to the car, just bolt on and go, no rubbing issues.