I had a 1968 that I lowered, bagged it actully. I used 3" drop spindles and air ride tech upper and lower control arms which fixes the alignment at the lower ride height. I C knoched the rear and bagged it also. Used an Sanden AC compressor for the pump, would make 160psi in about 20 seconds, with a adjustable pressure switch in the tank to control the pressure. When the pressure dropped it engaged the clutch on the pump and filled the tank. I used some genaric valves off ebay and wired it to an old arcade joy stick mounted on the bench seat. I think I spend $500 total with a lot of labor.
It was really cool and the sheet metal sat on the pavement but limited the use of the truck a lot. I couldn't drive it in the winter becuse the condinsation in the lines would freeze. And If I lost air I would be stuck on the road.
I guess I'm saying use the drop spindles and springs but don't go to far.
