Air Shocks 76 Dart Sport

I think espo sells springs that are as much as +3" over. If you want to go higher than that you'll have to flip the perches on the axle. That would be a cheap solution by itself, weld a new set of shackles on the top of the tubes like a truck and lift the old girl around 3 1/2". Could dial in a correction on the goddawful pinion angle while you're at it.

Air shocks are horrible, not only to they do a lousy job of dampening the springs (their job!) the shock mounts aren't meant to carry the weight of the car (which is what happens when you raise the car with the shocks) and will eventually fail. Obviously you're not worried about the handling, but at least if you raise it with the springs you won't break stuff. Raise it with the shocks or extended shackles and you'll have even worse handling and broken parts in the long run.