Camber and caster adjustment on these trucks with the Dana 44 or the corporation 10 bolt are done with an upper ball joint bushing adjustment or replacement. The factory installed bushing has if I remember correctly, minimal adjustment capability. I just did mine and replaced the original...
My experience with the Caddy rear calipers has left Me with a desire to go a different route for 4 wheel disc setups. On My 74 Blazer I converted to K30 I opted for the Hydrovac system and used front 1/2 - 3/4 ton Calipers on the rear with an adjustable proportioning valve that I use to dial in...