Found my dads original 1971 duster!

340sFastback said

Have you pulled your thermostat, make sure its not in backwards? Put it in boiling water make sure it opens?

I would drill at least one 1/8 hole in thermostat to insure no air lock exists. I have three 1/8 inch holes in mine

North of 200 degrees F and would not be comfortable with that on my car. Over heating can cause heads to warp and a host of other issues you don't need. My two cents.

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No, I haven’t pulled it. Maybe I’ll do that tomorrrow. I’m assuming it’s in correctly, because the engine builder installed it, as the water pump was on the engine when I picked it up. Before taking it out to the idiot. But you never know. I bought 160 and 180 degree thermostats
I don’t like seeing those temps either. Waiting to hear from engine builder on what temps I should be seeing, with it being so new