im looking at the shackle flip setup DIY has,looks good,but dont know anyone who has used it,need your help,i have a 1980 k10,four inch lift springs in the front,and cut shackle in the rear,wanna do away with that,question is,if i put the shackle in the stock location,how long of leaf springs and hangers do i need to keep my four inches of lift ,and get the most flex,any help would be appreciated,thanks