15x8.5 question

I ran 15X8.5 Centerlines on my Barracuda with 235-70-15, 255-60-15s 275-60-15s and 325-50-15s. The 275-60 was the best fit. 4-7/8" backspacing. The 275 and bigger needed the springs moved in. I dont think you'll stuff those under a Dart with out some extra work though.