Electric Choke Q-Jets
An electric choke can significantly improve cold-weather operation over other original choke styles. Any carburetor originally fitted with a hot-air thermostatic choke coil can easily be converted to the later GM electric choke. However, to prevent a vacuum leak, the hot-air choke uses a gasket between the choke coil and housing. Since the housing acts as a ground for the electric choke, this gasket must be omitted and the vacuum sources plugged when converting. New electric coils should be available from your local parts store or even a junkyard.
All that’s needed for proper choke operation is a 12-volt power source that is activated when the ignition key is in the “ON” position.
A good power source location is at the windshield wiper motor. It is usually mounted on the firewall behind the engine and has a wire that is activated when the key is switched to the “ON” or “RUN” position.