Stevedart it will work out fine. I did the same thing your doing with stockton rally wheels in the back. 27" X 10.5" on 15's fit fine. I've got about an inch on each side and went with a 5.5 back set but think 5 would have been better.
Man, that's around the same size as a 255/60/15 drag radial. That's the tire I was hoping to get under my '71 Dart without moving anything.
Not to hi-jack this thread, but I'd really love to hear definitively that someone is running 255/60/15's on a stock spring location Dart with no issues. If all it takes is the right backspacing wheel, I'm calling Stockton tomorrow.
BTW, I was able to put 245/60/15's on a '65 Valiant. I had 15x8 wheels with a 4.875" backspace and Espo springs arched 2" over stock with no problems.
