Apparently, the above was not quite clear enough.

You are on your own for almost anything you choose. There are no "alternatives" or other "options." You are breaking ground with whatever you choose.

There is limited talk about the Caddy motors. Search here, search Planet Isuzoo, search the Internet. You might find some references, but it has been done only a couple of times, that I know of. At least once, but less than 5 times, IIRC. My memory is not the end all answer, but I recall very little "How To" in the collective memory/intelligence of the Isuzu internet community.

Outside of that, anything you choose is totally custom. Ground up, like any other full engine/tranny swap. You can pull information from anywhere that has engine swap experience, but in the end, you will have to bolt it in, fab up what is needed and work out the bugs unique to your vehicle.

I wish you luck, but the road you desire is not an "easy" one.

Michael