My 1972 Duster is running VERY HOT!!

72Dart6pack said

15 psi.

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16 psi according to the 1972 factory service manual.

Paladin06 said

Thanks. I had the pump replaced last year due to a leak. The fan rotates freely by hand and has no wobble. I'll try replacing the lower hose as it does look bad but it has a spring in it. The radiator has not been flushed in 5 or 6 years at least. Well I got work to do but not today, it's Easter Sunday.

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Check the impeller with the fan belt removed. A tight belt can hide a little play in the shaft. Plus you can take a better look at the belt and tighten it if necessary anyway.

And I haven't mentioned it yet, but there's always a gauge problem too. You said you heard boiling on shut down so that's probably not it, but it might be worth checking with one of those infrared thermometers to see if it's in the same ballpark as the gauge readout.