I had an 85 for some time, with the carter carb - it wasn't great, but seemed to run OK after a good cleaning (I had to take the venturi out and clean them with guitar string several times).
I found that doing the TFI upgrade (
http://www.jeepz.com/forum/engine/16...tml#post182641 (TFI ignition upgrade) ) increased the driveability alot.
Would it be possible for you to hack up a stock air cleaner to fit over your weber?