Tim the pump is still in the truck but if you go to the NAPA web site and look for 1956 water pump for Chevrolet you will see it. Its the one with the 5.25" shaft listing and has an exposed impeller.
I understand that Patrick's makes the pump the way mine is.


1949 Chevy 1/2-Ton
"Sedgewick"
In the Gallery
1989 Caprice