I have been working over the last week on swapping a hyundai 3.0 into my 91 LWB Montero. I have read several other posts and thought this wouldn't be a bad swap. Especially because you can find those engines with fewer miles on them and cheaper. Everything went pretty good.
I tore the engine down to the short block and swapped over the oil pump, oil pan, and oil strainer (the main bearing assy did not have the holes machined for the two other bracing holes for the oil strainer - not a problem - I believe the it will hold with the two upper bolts in). I also swapped over the cam shafts with the drive gear for the dizzy and the alternator bracket. I grinded off the two locater pins where the A/C bracket goes on the drivers side of the engine. My biggest surprise came when installing the engine mounts. That was the largest problem.
On the drivers side there was only on hole on the block that was machined for the engine mount bracket. On the passenger side it was one hole short. I had to replace both
my motor mounts (completely fell apart when I pulled the engine). I just decided that one bolt will have to do since there was really nothing that was holding it on before. I guess I could always take it later and have it welded if it all works out. So far this is the only issue. I have yet to get it cranked though. I am now in the process of putting the engine back it. It is a bit## trying to mate the tranny and engine up. I am going to get a engine leveler and hopefully make the job a little easier. That pilot hole from the torque converter to the flywheel is unforgiving. I polished it and I am going to lube it up before trying it again.
Issues:
1: Swap over oil pump, oil pan, and oil strainer.
No holes on Main Bearing Assy for bracket on oil
strainer.
2: Grind off locating pins on Driver side of engine
Where a/c bracket goes
3: Change over fly wheel
4: Changed over alt bracket and drive gear for Dizzy
5: Only one mounting hole on drivers side for engine mount
and one hole short on passenger side for engine mount.

Sorry, I wish I would have taken pics but I was in to much of hurry to get it done. My truck has been down for about two months and I need to back on the road. It all started with a broken spark plug and then it just went down hill. Lost both back cylinders and a valve. Which probably why it was running rough to begin with and not the plugs. LOL