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First thing I'd suspect is that the gauge reading is wrong.
These cars are getting old, and anything can happen
There's an "instrument panel regulator" up behind the panel that feeds the temp, oil, gas gauges reduced voltage. These can go bad.
The gauge itself could be innaccurate.
Are you sure that the sender is the correct one? Even if correct, it could be bad.
Try and find something to measure temp, if nothing else, find a cheap HVAC or meat thermometer and tape it to the side of the top hose. Wrap a rag or two around it to insulate it
The difference in the manifold should not make a difference.
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