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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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