The older 1, 2 & 4 barrel Rochesters used a thermostat where the hot air tube connected to the center of the thermostat. The thermostat was usually metal.

The hot air thermostat is illustrated on the left. This can be replaced by an electric choke thermostat TH1051 as illustrated on the right. Run a hot wire from the thermostat to something that provides 12v while engine is running.

Electric Choke
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