70 Dart Front Wheel Question

Ok, then with those brakes and a 15x7” you need a 4.25” backspace and you can run 225/60/15’s. If you run less backspace than that, you’ll have to run narrower tires. The issue is that a lot of aftermarket 15x7’s only come with 4” of backspace. With 4” of backspace on a 15x7 a 215 is pretty marginal for clearance, it can be done but it will depend heavily on your ride height and the body tolerances on your car specifically.
Thanks for the information.