If you have a Holley 4bbl, there is an electric choke assembly available from any speed shop in the universe, for less than $50. It replaces the manual unit with a series of small castings and the choke heater. It needs one hot wire to the choke assembly to work. Do NOT use the ignition coil as the source of 12VDC power, though. Doing this will limit the engine to about 4500 rpms tops as the choke sucks electrons from the ignition. Find another source of 12VDC, prefereably ignition-switch controlled so the choke is not on constantly. Holley includes explicit directions with the assembly and only a screwdriver is needed to install & adjust.