Another overheating situation 63 Slant six

Hideogumperjr said
The oil is fine, no foaming and minor discoloration, time for an oil change soon. I topped the radiator back with fluid and squeezed the bottom hose and yes there is movement and bubbles there but how accurate is that of a test?
The water at the bottom when I drained it was really cool, now warmth and the upper was quite hot.
Any more suggestions bar just replacing the radiator? So close to wits end!
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Water pump? If all was working well until recently, I would discount the radiator being a problem. Though possible, they normally don't fail on a daily driver. Without a thermostat the flow ought to be very fast in the radiator and the bottom hose should be quite warm. If not, the water pump is the next stop I would make.