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KobraKarl,
These are all very good suggestions. While you are taking things apart, pull the thermostat out, and verify it's accuracy in a pan of water, on the kitchen stove. Put an accurate thermometer in with it, such as a meat thermometer, and verify it's opening temp. as compared to the thermometer. Also, verify your gauge is accurate, and take into account your sending unit location. This can also effect temp readings. If everything is functioning properly, your engine should not operate much less than 10 degrees below the thermostat opening temp., at it's coolest point.
Good luck!
Dave
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