73-87 front lift springs on a 67-72 HELP

[low900rr]

Whos done it here and how did ya do it??? Pics? I just recently started working on my 69 chevy that im changing from 2wd to 4wd. I was gonna use the parts that diy4x sells but its required that you use 52" rear springs from the 73-87 era. Problem with that is your limited to 8" springs and I wanna go 12". The other bummer is I have my K5 here with a pretty much new 12" superlift kit on it but the front springs only measure 45" eye to eye. I was looking at the diy4x kit and was thinking I could use the left mount on the right and right mount on the left. Im not running a steering box cause its going full hydro so I could just add some extra bracing from the mount to the frame cause thats where the frame kicks up. Whadda ya think??? thanks