[snydes]

If it is the original trans to that engine, and the engine is a real '66 L72, all of which I would say is unlikely, it will have a vin derivitive stamped on the transmission case that should match the vin on the block (provided it's still there of course). The engine would have the code "IK" for the suffix code if it was originally a vette L72 equipped with a M22 or "IP" if it was equipped with a M21. If you do get lucky and it's a matched '66 Vette engine and trans, it's worth a whole lot more as a set. Good luck! Can't wait to hear what it is!