Hello, I recently found a neat 69 Pontiac Tempest i was looking at buying, car ran, but only problem was the water pump. The owner replaced the water pump with a unit he got from O'riellys, well it sits about 1/2-1inch further out than the original, and as a result the belts don't line up. Its an original AC car but the ac has been removed, and its the original 350 to the car. My question is are 350 and 400 water pumps the same and are there 2 different pumps? Where can I find one that will work as it seems the local parts stores will be no help. The owner kept the original water pump to reference after he saw the new one didn't fit, he didn't give a reason for replacing it. Thanks in advance!