I removed the engine, transmission & transfer case as one complete unit from my M548A1. I used a civilian wrecker & spreader beam to do the job. It wasn't too difficult to do, just a lot of unbolting of stuff in the way.
A heads up to you: there is a a large flexible oil line that connects the steering differential to the bottom of the engine (shared oil sump?) that'll have to be unhooked before you can you can remove the engine. It can be accesssed from underneith the hull via a round access plate that is bolted fast to the hull. It was a real PITA to get to.
Good luck, let me know if I can be of any more service to you.
Matt