just got a new to me 72 blazer the best one I have ever had no rust!!!! I've got it stripped down to bare metal,even the rockers are orignal. anyhow I have some 73 up 8" superlift springs I'm going to put on it from a previous project has the 4" springs that are on it are only 1" longer than the 8" springs I have. I have ORD extendes shackles already but I was thinking about the heep boomerang shackles to make up the difference.Has anyone tried this??