Reuse a water pump from a parts car?

I have a parts car with a 318, and it happens to have an aluminum water pump on it....

I was wondering if it is okay to use? I would love saving a little weight. The 318 ran when i got it, but has sat for a decade and the motor was gunked up and dry rotted.

The cooling system was in great shape and held full coolant.

My tech buddy said not to use it, because it has sat for so long.