The pump shown by Sedanman should line up perfectly if on the cast iron water pump.
Warnings; Cracking the return tube on the reservoir during the rebuild process can happen. The "how to" videos found on YouTube never mention this.
This pumps belt cutting through a short lower radiator hose happens too. If that hose isn't Gates, came from Advance, etc.., don't push it up onto the water pump further than it takes to get a clamp on. Gates hose can be pushed fully to the stop cast on the water pump.