Need help

[GMB1985]

I have a 71 that I'm lowering and have a quick question for you guys who have some experience with flip kits. The truck has leafs and I'm doing a flip kit for the rear. I already have installed front drop spindles and 2 inch drop springs it brought the front down 4.5 inches now my question is a flip only yields 5 inches correct I don't want the truck to rake so I will need to go more then 5 do I install drop shackles or blocks and the smallest shackles only come in 2 inch that would put me at 4.5 front 7 rear which might be a little to much 6 sounds better just need a little wisdom from you smart guys out there