does your car have a coolant line that keeps the carburetor from icing up? if so that might be the best way to heat it if you don't want to have a block heater, if you do have a block heater then the heat should heat up the carburetor as well.
The use of the choke is not because the carburetor is cold but more so because the combustion chamber is cold, again, a block heater will help a great deal with this, warm fuel might not hurt but if you get the fuel to warm it's going to cause it's own problems and you are heating such a small area that a 6 foot chunk of 120v heat tape would be over kill so you could get away with cutting it down to 1/10th that and run it off 12v, 6" of heat tape should be just about right to keep the fuel bowl warm.
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