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I drained the coolant for the second time, almost all of it was the Tap Water I poured into it after replacing the Thermostat while the truck was still at the auction Yard area.
I put in 3 gallons of distilled, while idling, got engine temp up to normal operating temp then re-drained the cooling system again, hoping to get the Tap Water out of the block.
I then re-filled the cooling system with 2 gallons of the Motorcraft Gold VC-7-B ($46 ea.) and the rest with Distilled water. It should be good to go for several years now