During your flushing, have you disconnected the radiator from the engine completely, then flushed the engine by itself?
With the radiator totally disconnected from the enging, and as you are filling it from the top with your garden hose, is it having a tendency to fill up on the top of the radiator? Seems a good radiator will drain more to the lower end than most garden hoses can put out. If this is not true, tube blockage, is probably at fault. The lower radiator casting is the lowest part of the system, and it could be full of rust crud that most likely won't "flush", and will have to be mechanically removed.
In the two F-20s that I did some work on, the block contained 2-4" of sludge that probably wouldn't flush out. I used a small piece of tubing that would fit down into the coolant holes on the top of the block, duct taped to a shopvac, and after some time, was able work most of it loose with a rod & vacuum it out. After then, I used a piece of copper tubing attached to my garden hose to flush the rest out the lower radiator hose fitting.
Pulling the sleeves would be easier, but did't want to do that.
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Today's Featured Article - Product Review: Electronic Ignition - by Staff. Oil, for example has come a long way in the last 50 years and I don't use anything but the latest API grade available. I've heard the arguments for non-detergent oils but would never trade it for today's formulations. Paint is another, the modern acrylic enamels are great for resistance to grease and fuel stains, retaining their shine and they last forever; unlike enamels and lacquers . Still another is the alternator. No doubt using the original generator keeps the tractor pure, but for thos
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