use an A-body 8 3/4. That way it fits right up to your leaf springs and make a set of traction bars. Once you lower it you have to change your rear shock degree. The shock locations are to far in to work right..
I think the A-body 8.75 might be too expensive for the budget, and, I question the width vs the truck...… Maybe a C - body 8.75. Much cheaper and very close fit for the truck
