As far as the air shocks, assuming you're putting the back end up to give it a mean stance, you may end up losing some handling. You're increasing the center of gravity and thus potentially inducing rear sway. I would imagine the ride to get harsher as you increase the height. ( I don't have them personally, so I'm making assumptions.) I'm not sure of the design of the air shock but I would guess that the more you pump them up, the harsher the ride and then the less planted the wheels will be, maybe inducing more wheel hop over bumps. Just a guess. Correct me if I'm wrong.
They do make the car look really cool, though. But keep in mind that when the air shocks are jacking up the rear, your decreasing the load on the leafsprings and increasing the stress put on the upper shock mounts. I'm not sure on E-bodies but I heard rumor on old Camaros that have some rust issues the top of the shocks may poke through the upper shock mounts so you can see the shocks when you pop the trunk, so I've been told.
Also, if your jacking up the back to get tire clearance, there's always the possibility ( my pessimism or Murphy's Law?) if you're shocks spring a leak, your tire's will rub on the wheel wells, potentially damaging body/tires.
Again, they do look really cool!
Just my 2 cents.
