My 77 had the oem stock suspension bought 2" - 2 /12" front coils to level it out now the rear is low (maybe the old stock coils were really sagging)thinking of putting blocks in the back. When I measure from the top of axle to frame on front it is 9" rear is 7" so i need 2" blocks for the back? I have never done any suspension work so all help is very appreciated. Also the coils have changed the toe and alignment alot is this normal when raising the suspension?