14x5.5 what tire are you running

15x7 rims with 4.5 backspace allows a 215/70 on the back of a 73 Swinger just barely clearing the springs in a corner.
If I were to get 4 or 3.75 backspace rims I could probably run 235's as I have about an inch between the tires and the unrolled fender lip with 215's and about .25 clearance at the springs.

Running 205/60's in the front also with 4.5 backspace and have zero issue's up there.