What you are talking about is our Cool Ride kit:
http://www.ridetech.com/store/suspen...ar-system.html
You will notice we do not use the 2500lb air spring in this package. This is due to a few things (custom mounts are required to fit the stock packaging without cutting everything up, and a double convoluted air spring provides too much spring rate and will diminish ride quality.)
As posted above, if you want that thing to REALLY handle well you should take a look at the suspension package as a whole. We make quite a few parts for that car (if you've not seen our blue 66 you need to do some searching as we've thrashed on that car for years and is still one of the best in our fleet):
http://www.ridetech.com/store/muscle...tures_hash=V40