I might be inclined to rebuild it myself, Bill. Then & Now has the best rebuilding kits and I'm certain they can tell you everything you need to know about which pump will be the best to rebuild. For what it may be worth, I think the 52 Chevy and 52 GMC will interchange. Yes, very hot.

~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end