67 W200 Which motor would you use?

Dumped a quart of tranny fluuid in the cranckcase and ran it for a while today- no more knock and no more smoke. Going to change plugs, wires, cap, and rotor tomorrow and it should run like new. I will try to post a few pics this week.

thats what i do to... you just need to get it hot and let it drain for an hr