A common problem I run into on the Jeep carbs is that, with todays ethanol poisoned fuel, those two little diaphragms on the front and rear of the carb will crack or puncture and you will not get a good running engine. Usually though, that is more of a flooding situation. I have had better luck with the ethanol resistant kits from places like midwest military, but even better is to stay away from the ethanol fuel as much as possible.
Note there are also conflicting illustrations in the manual on which side the little spring goes on one of those diaphragms. I also go 5/16 on the float level by using a long shanked bolt.
There is some good carb info here:
http://www.willysmjeeps.com/v2/modul...wtopic&t=11341