If my memory is correct, that is an electronically controlled engine. You would have to swap in all that is required to run the engine (ECU, sensors, etc). I have heard of people swapping in a Cummins first gen 5.9 turbo diesel. It is full mechanical, with minimal electronics and pretty straightforward.
That Chrysler Ecodiesel is a great motor. Yes you could put it into the M37 provided you have enough time and money. Cause you will have to make engine mounts, You would have to think about changing the transmission and as mentioned above you would have to figure out all the electronics needed to make the engine run. But other than that piece of cake...lol!
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