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My mom's 73 duster did the same thing new in '73. I bet that Carb is a Holley! Maybe....maybe a Carter. It should be cast onto the side of the bowl somewhere.

Let it warm up, check the timing and adjust the carb & idle speed for now and see if that does it, then once you decide what you are gonna do with it, make the decision to pull the carb or not. Idle speed between 800 and 1000 RPM is a good ballpark to start in.