1992 5.2 Magnum

I found a Air-Gap knockoff on Ebay for around $150, and it has a dual bolt pattern. (LA and Magnum). It works well, and I'm very happy with it.

I chose to go the carbed route because it's easier to tune than the Mopar EFI systems are, and in your case, the '92 is an OBD 1 setup, so tuning it is pretty much non-existant unless you go to a full stand alone system to control the engine.

You could use a newer truck as a donor for the wiring harness and PCM, then you could use SCT or even MegaSquirt to tune things.