both of you can knock it off. now.
but back to the v8 discussion, v8s are notoriously difficult to make work in an XJ/MJ. not that they haven't been done, but they are usually full of headaches and there are numerous examples of failed swaps out there. even successful swaps are frequently hampered by sooling problems. be prepared to gut everything from your truck, axles included, and plan on a long and expensive journey. :( a chevy v8 would probably be the least amount of headache, since it's been done more than the others. but even then the adapter parts and custom parts aren't cheap.