That water pump is a very easy one to change. Should be available new at any auto supply, just take the old one with you to compare the shaft height. The engine may have been changed, could be a different pump than the truck originally had.
Chances are the heater core is bad, that's usually why one gets bypassed that way. There should be a hose barb screwed into the water pump, and another up by the thermostat. That is where the heater hoses were originally attached. They may have been plugged, if so remove the plugs and replace with hose barb fittings.
If you want to get the heater working, you will need to find a new heater core. That may be difficult for something that old, but I'm sure someone out there has one. May have to go to a truck restoration specialty supplier.
The core is easy to replace, looks like everything is done from under the hood.
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Today's Featured Article - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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