1989 Mitsubishi Montero Swapping engines.

My engine is kaput and I tried to find a used one but being so rare I could not or the price was way to high, so I researched and found a lot of different engines will bolt up, well basically the same engine used in a lot of Chrysler models, and of course the more modles the better the price for an engine and the better mileage on an engine. For example I can buy a 1995 Voyager engine with 57,000 miles for $350, same engine, SOHC but seems some changes have to be made, how radical the changes I have no idea, i.E. Motor mounts, oil pan/pump?

So my question is how much trouble will I run into getting one of the following engines to mount up to my 1989 Montero. Here is the list of cars that can be bolted up:

According to WIKIPEDIA, all these cars used the 6g72:
Applications
1990–2001 Mitsubishi GTO (aka Mitsubishi 3000GT, Dodge Stealth)
1989–1995 Plymouth Acclaim/Dodge Spirit/Chrysler Saratoga
1987–2000 Dodge Caravan/Plymouth Voyager
1990–1993 Dodge Ram 50
1988–1993 Dodge Dynasty
1988–1990 Dodge Raider
1991-1996 Dodge Stealth
1990–1995 Chrysler LeBaron
1990–1991 Chrysler TC by Maserati
1988–1989 Chrysler New Yorker
1990–1993 Dodge Daytona
1992–1994 Dodge Shadow ES
1992–1994 Plymouth Duster
1986-1992 Mitsubishi Debonair
2000–2005 Mitsubishi Eclipse
1999–2003 Mitsubishi Galant
1988-1990 Mitsubishi Sigma
1990–1998 Hyundai Sonata

Thanks

Nic