I don't have much experience with those engines compared to the renix motors but have some experiences with them. By the year, I believe that uses a long coil pack with three coils that feed two cylinders each. One coil goes bad, you replace all 3 at once. Instead of a distributor it has a cam sensor and the PCM decides which coil to fire and when. On that vintage of engine, can you pull the cam sensor and stick a distributor in it's place and run obd1 or did they change the block? The jeep I imagine uses a security system from the factory, so you would have to look into what it would take to get past that to use a factory PCM. Mopar and the aftermarket may also have a PCM that would run the engine, as I'm sure there have been quite a few swaps from a carburated engine to a 4.0 performed already. Also just remembered that at least one eaglepedia has a 4.0 swap how to in it already, I will try to find it and post it here.