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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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