need help purchasing street radials for my 74 dart sport

I ended up purchasing the 15x8 with 4.5 backspace for rear and 15x7 with 4 backspacing for front, I figured that it’ll be a safe combo with room for error and can easily be solved with some spacers if needed. I think tonight I’m gonna order the 255/60/15 for the rear and the 215/60/15 for the front. I’m not making Over 450 wheel so I don’t think that a 255 will feel much different from a 275 and I think it’ll look just as good. As I said earlier If there’s still too much tuck in the rear I’ll just buy a couple spacers and call it a day:)

If you have a BBP 7.25 or 8.25" rear axle you very well may need some spacers to get the tires enough clearance from the springs. The 255's should fit easily in the wheelhouse though as long as they're located properly.