Best riding rear suspension set up.

[vannatta20]

I have a 68 C10 with rear coil suspension. It has 5 inch drop springs from ccp and they are soft as butter. If someone sits on the tail gate it will almost bottom out! Whats a good spring for handling that has a little drop to it? The front just has 2 and 1/2 drop from the lowering spindles. Also it seems I need Rear Shock Relocator from no limit. I already have no limits panhard bar kit installed. Would it be better to use lowering blocks?