4spd /6 Question

A friend of mine is interested in buying a 360 motor from me, but before i sell it to him i'd like to know if it would bolt up to his bellhousing. He has mounts for the motor already but he has a /6 with a 4 speed. I dont believe it is a 833.

Do you guys have any knowledge or links.

Im pretty sure that the 904's bolted to smallblocks (which also came on /6's correct?) so what is to stop this swap ?