Go Joe,

I just know what I've read on the subject. The original Carter carburetor tend to be a lot more reliable. The Solex tends to be troublesome to get just right. A common upgrade is to use a Webber carburetor, but I don't have too much information about any troubles seen from the upgrade. A good source of everything carb related is the following;

http://oldjeepcarbs.freeforums.net/