Front vs rear wheel sizes for best handling

72bluNblu said
In the back it depends what rear axle you use. With an A-body 8 3/4 housing, BBP axles and the springs in the stock location you'd want about 5.25" of backspace.

Asking a stupid question here but I'd rather not assume....

Moving the springs in would allow for a 5.5 inch back space wheel. Correct?

Now the question is how much can be fitted with the springs moved in?