With the 55" wide, B body rear axle, the factory 14" ralley wheels and 225 wide tires would rub the body when going up a roll curb at an angle. This was one reason I went to an A axle.
I take it those were the factory 14x5.5" rims then? Which are too narrow for 225's anyway, btw. It's all about having the proper backspace for the axle you have.