Not a guru but here's a few things.
Do you see coolant flowing in radiator when t stat opens?
Pressure test radiator cap?
Running lean will cause over heating after a while but I would imagine manifold would be getting red
Do you have a temp gun to measure inlet and outlet temps of radiator to compare to gauge?
Dumb I know but correct rotation water pump and also, fan installed correct way?
Merk is right about timing too. Weights might seem to work but let's get some specs and numbers at certain rpms
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(2) Original, 100, 102, 124, 73, 800, #1 and #2 cart, brinly plows, disk, IH184, IH244, 1948 F Cub
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