Updating early 904 - is this a suitable donor?

Unless your doing a numbers matching restoration I'd just rebuild the donor trans. But remember a 66 trans. uses a torque converter with a smaller crankshaft register (1.53" o.d. vs. 1.81" o.d. for the later ones). so if your engine is a 66 you will run into a problem getting a torque converter that fits the trans. and engine.