wheel size confusion!

[3rdGen.c10]

okay.. I know there are a lot of talk on here already about wheels size and backspacing but no one that ive seen has said for sure what setup they are running up front as far as spindles and all. so here is my setup and questions. any help is so appreciated.

I have a 67 stepper and I am running stock 1985 spindles so that adds 1/2 per side trac width. so ive been told.

on the rear I have the earlier narrow rear end.

I would like to go as wide as possible on the rear with no trimming (just my preference)

and id like to go 8'' wide on the front but I like the outside width front to rear to be the same. so looking down the side of the truck the wheels are flush with each other. does anyone have solid backspace numbers that would achieve this?