g body rear control arms

Alright so my buddy has a gbody that were putting a dyno’d 550rwhp sbc in, so were going though and building up everything else. We are boxing in the lower control arms, and he wants to shorten the upper control arms to get more traction in the setup. There’s two styles of aftermarket ones, adjustable and fixed. Can anyone tell me the eye to eye length of the uppers on the shortened aftermarket ones? Thanks.

nevermind on this, ended up just boxing them in. will look into shortening down the road if he cant get enough traction.

if he ends up needing any gbody shit, let me know. i have a parts car sitting. its an 84 cutlass.

not thread jackin, but got a posi rearend for a gbody?