Ok I have an 81 Z28 .Just finshed the moter pushing 675hp no traction at all. Thinking of going with either a 4 link or full ladder bars. The rear end as it stands is mostly stock 8.5 30 splin on leaf springs. Keep in mine I wont to keep my back seat. I am plainning on driving it on the street also. so any help please and if any one has do this please let me know.