rim backspacing and to narrow or not to narrow

[topher]

I am building a 1969 c10 reg cab short box 2wd. I am almost done my frame just installed a scotts hot rod supper slam front end kit and a cpp rear air ride kit. I step notched the frame just behind the cab and boxed it.

now that you know what i have done so far what i am aiming for here is a good street truck i can drive in the summer that will handle decently well and have lots of power to put a smile on my face with. for power it will be getting a gm ls 376/515 crate engine backed up by a t56 6 speed.

I have two questions the first being what backspacing are you guy running on your rims i want 20s all the way around with probably 9x20 in the front and 13x20 in the rear. This truck will lay frame and i will tub out the rear as well as raise the bed floor up for the stepped up frame.

my second question is what rear ends are you guys running i have a guy that can build me one locally and i know i will have to narrow it. I just want to see what you guys are running with your bagged truck and what widths you running.

I have built lots of vehicles but up to this point its been allot of 4x4s this is my first low ridder build i have done any info , tips and pictures you have for me would be great thanks in advance for the help.