The lowering springs, tubular control arms, dropped spindles and such are all available from less expensive sources. You can also install a 1-1/4" front sway bar from a '73-'87 C20 truck for increased handling. Those can be found in wrecking yards for fairly cheap. And as for those adjustable front trailing arm brackets, I believe a couple members here were doing that before Hotchkis offered them. look here....
http://www.67-72chevytrucks.com/vboa...d.php?t=278864