does the motor turn over? I don't recall you stating that.
If it DOES NOT turn over, put a wrench (socket and ratchet actually) on crank pulley on front of engine and make sure the engine turns over a full 360 degrees. If it does not, you need an engine.

If the engine is cranking over and not starting, have you checkd for spark? what do the points look like? plugs?

How long ago did the car run? Old gas can cause problems.

Batt going flat could be voltage regulator - i am pretty sure this vintgage car had a mechanical regulator that would be bolted to rad support. could be corroded, etc.