I PM'd you back. I don't use air bags in the suspention. I found that the Moog cargo coils work well. You WILL however need a weight distribution hitch set for the car. There are many opinions on it, however, I went with the Reese setup. It costs about 8-900 installed, but as the others can attest, most any weight distribution levels out the car to an almost stock stance. The springs with the weight bars should be just fine, but they won't be without the weight bars, nor were cargo coils alone.
Also don't for get the brake controller. There are also opinions on that too, but the one I tried was the Prodigy. Works like a dream.
Anyway, contact me off forum and we can talk more in detail and possibly meet to trade B-Body info. You are about 15 miles or less from me.