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How are you measuring the temperature ? Are you actually overheating ? Is the fan coming on normally and at the right temperature ?
Just had my fans replaced and they still run hot and the thermostat replace and finally did the job, also 5 years ago the head gasket on 3.9 crapped out and had them replace and the head shaved and now it a race car almost, upped the Horsepower and now it's about 320-340 HP run's like a scolded cat
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my fan was not coming on that much and they replaced the fans and the fan sensor then the thermostat, only thing left is the water pump and that can be checked by starting the car cold open the radiator cap and see if the water circulates when it gets warm
The timing may be too retarded for the compression increase of the shaved heads.
I had something similar on a different vehicle. It wasn't until I replaced the radiator that the problem was corrected. The fact that your heater helps is also a sign. It is possible that the cooling passages in the radiator are clogged and there is inefficient heat transfer of the engine coolant. Coolant additives that prevent corrosion break down over time. Coolant is often neglected. Regular coolant changes, the use of the recommended type coolant, and use of distilled water are necessary to prevent deposits on the inside of the core tubes. Flushing typically doesn't help much or not for long because the deposits stick or passages are completely clogged. A test that may help diagnose could be preformed with a infrared laser thermometer. Read the temperatures of the upper and lower radiator hoses to see how much cooling is being done. Guessing, inlet coolant would be about 150*F or less on an efficient, well working system, depending greatly on the ambient air temperature. Note that air flow while driving adds to the cooling process.
I think your block is plugged,
You can find out the coolant temperature via the OBDII & an app like Torque. Without this information it's just pure speculation. There are tons of threads on here about running hot check out the search page.
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