Engine overheating

What I did..

Multiple engine flushes. overkill, but did it anyway.
IR Gun to measure temp at thermostat housing, at hose inlet to radiator and lower hose outlet at bottom of radiator, should be 25-30 deg diff.
If you haven't already, put in a 180deg termostat. The IR gun will tell you when it opens when engine running.
I picked up a Mr Gasket TermoCap (built-in thermostat), 16psi, which should give you a closer temp reading.
I had also replaced my radiator since it was the original on my duster, but that wasn't it.
What did fix my overheating issue was either the fan clutch or the water pump. I replaced them both at the same time.
My gut feeling was the water pump, which I replaced with a GMB 1201070P High Performance pump. I read else were that cavitation
is an issue, not getting the water to flow sufficiently with old style.

Mine would also nearly peg out just driving 'normally' down the road, esp when 55+.

Anyway, my two cent's worth.

When you DO fix it, let use know what you did.