220 at idle in traffic is okay.
at speed it is way too high
do you hear boiling, bubbling when you shut car off? that is bad thing.
If you can see 220, park the car and walk away without noise or fluid hitting the ground, I would suspect your gauge or sender. Gauges are notorious for not being true. Try putting a candy making thermometer in the surge tank and starting the car. see if the gauge matches the tank as things warm up.
take it from there.
Larry
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