Tommie for the rear sway bar, might want to consider one off of one of the mid 70's Lincoln Town Cars. They were quite beefy and the ends were mounted to the lower control arms. Could probably make some new links and get one to work on your bird.

As for the air ride suspension, it gives the height adjustablity as you said. I have used both the bags and the "Shockwave" shock absorber type. I like them both and they are not that tought to mount. Refresh my memory, does your bird have leaf springs or coil springs on the rear now? Kenny D. builds a lot of cars with air ride suspension, he's the guy to ask about whose stuff is the best....