I beam axle camber is adjustable- - -but most shops don't have the equipment, or the knowledge to do it. It's done by bending the axle between the spring mount and the spindle. A piece of HEAVY chain, a piece of 6 inch or bigger H beam longer than the axle, and a 30 ton bottle jack is all that's needed. Any shop that does heavy truck (like 18 wheeler) alignment can tie that flimsy little axle into a knot. Caster correction is easy, as long as both sides need the same amount of correction- - - -just use a shim that increases the angle appropriately. Changing caster on one side involves twisting the end of the axle- - - -something a big rig shop can probably do, but it's usually not necessary. Ignore all the specifications like "total toe" etc.- - - - -just adjust the tread centerline measurement 1/8" less in the front than the measurement at the back, measured at spindle height. Correcting the steering wheel off center situation will require a drag link that's adjustable for length- - - -something Chevy chose not to do at the factory. There is a tech tip somewhere on this site, I think, that explains how to do that. Good luck!
Jerry
