The Nutter takes away all the computer junk on the carb. It's supposed to help a lot. If you get a manual for rebuilding a carb, it's really easy. I even think it's fun! The bump thing you mentioned is probably a float issue. Here's a link that may help-
Easy Fix for Jeep 258 Carter BBD Idle Problem . I have a Motorcraft 2100 carb which is supposed to be really nice, but I think I've got a lemon carb.