I have the same exact symptoms going on. I also used an IR themometer with the same results. I have an aluminum radiator with electric fans, checked the water pump clearances, etc.
I bought a new water pump (PWP381) from cardone that's supposed to have an improved impeller. I was gonna install it tonight but, looks like I better check my timing instead. What's funny about mine is it ran cool for the first 75 miles or so then overheated. It now will overheat while idling or driving only a mile or so. The distributor is tight so I know it didn't move. I will check it this evening.
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1967 GTO (project, surprise gift for dad)
-Lexus pearl white paint
-2005 gto brakes, irs independent rear suspension axle,
-and wheels.
-2006 gto front and rear seats
1972 Vega
-waiting for turbo v8
1976 Nova
-owned since high school, it's been sleeping for over 15 years!
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