Tire size that won't rub

I have some 14x7 wheels with 4 inch backspace.
I have a 72 Swinger
What are the widest and tallest tires I could fit in the back without rubbing.
Same for the front, I don't want any chewed up tires. The front will likely be smaller I know, but I want to know the biggest so I can go lower.

Thanks for the help:prayer: