There may still be a tranny available in a boneyard up near Pittsburgh, the engine was blown though.

You may not need a new engine. Head gaskets may cure your ills (& pressure flush the coolant from the engine while the heads are off). That's what I'm in the midst of on Boy's Ebony (because of slight overheating issue).

It's prolly more than a 'shade tree mechanic' type job ... but that's what I'm doing.