A few years ago I took several leaf springs out from under a 56 ford PU with a corvette rear end. We put airshocks and beefed up the mounts some. Although the airshocks did the job well, they took longer to raise and were being run at higher pressures than an airbag or shockwave would need. They also seemed like they lacked the firmness of a larger bag when you hit a bump. (probably a product of some law of physics)

Those shockwaves are very nice though. I'm putting a 67 Imperial together for a friend with Shockwaves front and rear. We'll keep the torsion bars in the front to suppliment the shockwave.

There are cheaper versions of the bag over shock type assembly, but they have no adjustability and offer even less travel than a shockwave.

Later, mikey