After chuch, I decided to drain the coolant, remove the thermostat and do a flush or two on the cooling system.
You know what they say about a 30 minute job? All is well until you break off a bolt. Also I found a mess. Spent all afternoon cleaning a flushing. I started with a CLR, ran the engine for 15 minutes. Drained, flushed. Then 3 more flush cycles using mixture of TIDE / Borax. I added a 50/50 mix of green anti freeze.
The broken bolt. I attempted to weld a nut on the "nub" 4 times, no go. Had to go to NAPA to get a Tap. Drilled it out, picked out the pieces of the bolt, then re-tapped the hole. Turned out good. Had to use a hardware store bolt for now. I'll order 4 new bolts for long term. It's all got to come out anyway when the head comes off.
I have a radiator, head gasket, water pump, belt idlers/tensioners, de-smog kit and gaskets on the way. Most likely I'l need a bunch of hoses too. I'll drain the coolant and flush again when the project starts.
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