What is the largest wheel's I can put on a 1974 dodge dart 360 sport

TF360 said
I would say 255-60-15's work really well. 8 inch wheel with 4 1/4 backspace. You should measure your backspace for a perfect fit. Just google how to measure wheel backspace

You are correct!
That's exactly what I am running on my Demon, they do work well and no rubbing.