Motor is a bolt-in, engine management will require either swapping the entire engine/underhood/dash harnesses and ECU or having your harness merged with his (there's an outfit over on NASIOC that'll do that, fees seem to be in the $500-800 range)
If his is AT it's probably best to swap the trans with it as I'd be willing to bet it's different, and it's not much more work to do so.
If you don't want to take it on, what's he want for the whole car, and where's it located? I'd be interested in it for swap fodder.