i use a site called crowleymarine.com they realy seem to break things down realy good as well when it comes to part numbers, they even showe you a break down of every part that you want to look at and it is all numbered. they are a little high on some of there parts but i mostly use them form the part numbers and motor break down
HI SACCO60. Here's a parts catalog for your motor. I have a '66 20 myself. I don't think your pump can be rebuilt, but I could be wrong, if so you'll need to buy a new one, or a good used one. Check ebay, marineengine.com, aomci.org for parts. If it can be rebuilt check right here at iboats for a rebuild kit.