you gonna need the following:
1: 6 cyl motor, with the flywheel, possibly the starter as well.
2: 6 cyl computer
3: complete under hood wiring harness, and possible dash harness as well, just in case.
4: 6 cyl frame mounts-- you cut the old 4 bangers off and weld in the new mounts, once you get it lined up properly. No there is no measurement out there for this, so take all the measurements off the 6cyl jeep and lots of pictures.
5: exhaust manifold and front pipe from the manifold back.
6: complete air intake setup from the 6 cyl.
7: fan shroud and clutch fan from the 6 cyl.
8: power steering hoses from the 6cyl.
9: front and rear drive shafts.
10: upper and lower radiator hoses.
There is prolly some other stuff, but i can not think of anything.
Also if you plan on using you original tranny then you do not have to worry about changing out the transfer case. But if you are changing them make sure you get the transfer case with the tranny, other wise you might have to change the input shaft on your old transfer case. You can search these forum for that info on your year.
MAKE SURE- you measure as many times as it takes before you cut or weld anything on the jeep. Also do alot of reading thru the forums for questions you might have, cause we are not always here to answer your questions.
If anyone wants to add to the list please do.