Not an expert, but I'm willing to brainstorm with you a little.
I had the 4.3 in an S-10. Did the the same thing. I had to flush out the heater core with the hose and that fixed it. All kinds of gunk came out. Sounds like you did that. It might be worth another shot.
I also had an issue with an intake manifold gasket. I can't tell you exactly what it was, but I was losing coolant into the oil pan.
Is it possible the belt or tensioner isn't quite working like it should? If there is slack, maybe the water pump isn't turning quite like it should? Just a thought and something I would look at if it were mine.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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