As good a place as any to add some more Q-jet choke info:
If converting from a hot air type choke to an electric choke, be sure the fiber gasket is removed from the hot air choke housing. As has been mentioned previously, the electric choke heater grounds through the choke housing to the carb body, to the intake, block, etc. That is, unless the electric choke is grounded through a machine screw and nut that replaces one of the rivets that hold the choke coil and heater assembly together.
Hot air chokes use a small plastic fitting that connects the choke housing to a vacuum source in the carb body. The vacuum port is just a hole and can be easily plugged w/a small lead shot tapped into the hole. The hot air intake port on the choke housing can be capped off, it's no longer needed.
Also be sure the choke pull off is working. Otherwise the pull off will not set the choke flap in the "pull off" position. That's when the pull off tips the choke flap open a set amount as soon as the engine starts so the engine can idle w/o loading up.