I am doing the 2.5 to 4.0 right now. If your set on doing it i would not do the V8, i had the chance to but my research told me i would have to put different axles in and change my dash wiring harness, so far i did a little mod to the harness. i would have the donor right next to you as it would be easier, i do not and its very hard finding parts. i bought my jeep in the process of the swap which is i had to do the whole thing and still am.
my list is, Another engine 4.0, 94 cherokee 106,xxx-300
new t-case-150
PCM-80
drive shafts front and back-100
bolts-??
all i can think of, what i need to buy still:
clutch kit
exhaust
radiator
all i can think of. im hoping the transmission i was givin works.
there much more i bought and need...
thats just an idea of what im going through.
have alot of 4 cyl parts and another 6 cyl i didnt use.