Eary VS. Late A-body rear end widths

There are some pretty good wheel backspace calculators online if you take some time to search. They can help you with your measurements to determine what will fit. The one I had used in the past also had a tire chart/calculator that gave the diameter for various profiles and sizes which is pretty handy. I don't know how anyone figures all this out without using a resource like that as it is so complicated.

Here is an example, but I have never used this particular one.
Wheel Offset Calculator