Taking all points of view into consideration, he can always try the swap, and as parts break, either upgrade the broken features or just replace the failed component completely. He just has to understand that he is probably minimum 1.5x the HP and Torque with the 360 than he had with the 6 cyl. Now the other consideration he has in his favor is in Æ77 you could get a V8 in the CJ7, but since he asked about motor mounts I have to assume he has one with a 6 cyl. And like anytime one goes wheeling, he should always make sure he goes with other rigs that are all about equally capable of pulling each other out.

Sean