What Shawn said plus this. Once you have the pump working fire up the engine and let it warmup and while running look for water leaks around the head and manifold. If you find no leaks there and she runs smooth your OK. However if it runs rough take a good look at the plugs for moisture and/or do a compression check to see if the head gasket leaking between the cylinders. If you find an issue the head gasket will need replacing, not a bad job depending on access.
Dave Neptune