Would you be able to rebuild your own pump, or have someone else do it for you? They are available on Ebay for 35.00. I bought one and followed the shop manual and did the rebuild myself. You will be reusing your old pulley. These are old kits and the gaskets were very dried out, so new pump gaskets will need to be found. Type in "water pump rebuild kit GMC".
They fit all pumps on 228 through 302 from 39-62, except maybe some military long shaft pumps.
Joe
