I have a 1974 dodge dart sport with the 8.25 rear. I have always wondered if 15x8 and 4.5" backspace will fit. I have installed the offset mopar shackles and front spring mounts. Also moved perches. I plan for 15x8 rallys just not sure if they fit.
you should be good, the limiting factor is generally to the outside ie the fender lip which you don't need to worry about as much with the wheel opening on the dart sport.