That particular motorcraft carb works pretty good on the jeep engine. It seems to give a bit less economy. But it is the easiest of all carbs to work on. It is simple compared to the stock carb.
If you observe closely there should be a home made adapter piece between the carb and the jeep rod that opens the carb. As there is a difference in how the two carbs have their opening pins. If this adapter isn't made well the carb won't open all the way.
Many guys have installed the wrong carb on their Jeeps and they run way too rich. YOUR carb should have a --108-- stamped on it somewhere. (I think that is the correct number, I havn't done one in several years) If the number is other than that the carb is too large for the Jeep engine.
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />