Tire size for 70 Dart

Has anyone tried putting 15 by 10 wheels on the back of a 70 Dart? SBP axles. Tires are 295 50 R 15. Pretty sure the tires won't fit. Wheel backspace is 5 or 5.5, not sure yet. I have 6" between outside of brake drum, and leaf spring. Guess I could put air shocks on, and raise the heck out of it! LOL. But I don't like that too high look.