Or you could take on the rotary swap I'm doing.. :-)
Oh I'm sorry, did you say easy? It ain't easy! Anything except for the Suzuki 1600 8 valve motors would have to be considered a PITA. But sometimes a pita is worth the trouble.
Things to consider are engine length. Most V6 motors will fit better then a 4 banger as they are shorter. Another consideration is the tranny length. If you want to keep your t-case in the stock location, then you really need to watch the tranny length. Anything over about 24 inches including bellhousing is going to be an issue. Please make some measurements to confirm this number.. It has been a while.
Keep in mind that you are going to need to cool whatever you throw in there, so keep plenty of room for fan, radiator and oil & tranny coolers.
Anything over 150 hp is at risk of killing the stock t-case. If you are looking at something over 150 I suggest you get rid of the stock driveline or plan to run an automatic tranny.
My last motor swap was 100hp, and it was pretty good. Bunches of low end torque made it much more fun to drive as I could pretty much pull away in just about any gear, and good RPM range made it fun in both the rocks and the sand. (We don't have mud here.) But on the highway it still seemed like it needed more power.
If you are going to do a tough motor swap make it worth while, and have at least 120 hp on tap. My current project has 160hp with stock exhuast and 170-175 with bigger exhuast. I'm running it through a 4 speed automatic with true converter lock up. This should make for an interesting swap.
Problems I'm expecting are: space for radiator, oil and tranny coolers, 32" long tranny length, the electronic engine and tranny mangement.
Always remember to do the job right! Any shortcuts will bite you in the butt on the trail!
Have some older photos at: