Put a mechanical temp gauge on it first - or use one of those infrared thermometers.
After that it could very well just be a bad thermostat or even missing one. Check to see if you can see coolant moving by removing radiator cap immediately after cold start. if you see flow, your thermostat is caput.
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1969 Judge, 4-speed, CR/Parchment, Quasi-Survivor, #'s match - under restoration
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