Narrowed A body rear questions.

I am currently running a stock sized a body rear with mini tubs and relocated springs.

I guess I should have asked what is the most narrow rear I can run with the deepest dish wheel?

I am currently running 29x12.5x15 tires on a 10" wheel but I want a deeper dish as I have a 7.5" backspace so a narrowed rear is the only option, and different wheels of course.