I don't think there was a 4bbl on any of the ZJ's. Same as all the other 5.2 and 5.9's in the dodges. Another option may be the ford 5.0 throttle bodies. They are easy to come by cheap but I am not sure on the IAC and TPS compatibility. I'm going to have to go back and look at my ford tuning info. Its been a few years.