Thanks to everyone for all the help. Got my wagon running tonight and it runs great. Got some fine tuning to do on the carb but,after 9 months of spending all my free time on it, getting to drive it was great!

Durham Missouri

Sorry didn't realize it would effect the MSD, my bad. I have a Pertronix II and it doesn't effect it.

The only overdrive related wire at the coil should come from the kick down switch, and that is to interrupt (shut off) the motor so the trans can come out of OD when the kick down is activated . Power for the overdrive relay should come from the ignition switch.

I don't think you can change that. The overdrive shifting works by momentarily shorting the coil so the engine RPM drops momentarily.

Should I find a new source of power for the overdrive then? The power wire for it runs off the + side of the coil also.

Durham Missouri

If running the MSD distributor, then I’ll suggest hooking the electric choke to a 12 volt source that’s closer to the battery or ignition switch.  Hooking the electric choke to the positive side of the coil will have the voltage to the MSD distributor resisted down and that is not desirable.

Lorena, Texas (South of Waco)

The use of the"I" terminal is what called the "hot start" so 12volts goes to the ignition during startup and drops to 9+ back on the ignition switch going thru the ballast resister. GM's use a 4th wire on their solenoid and a small brass clip that hits the copper disc when their solenoid is energized.
I would only use the positive wire on the coil for the electric choke if your system is not using the ballast resistor. If using the resistor use the lead wire from the ignition. I definately agree with a fuse in the el choke wire. Good luck.

56 Vic, B'Ville 200 MPH Club Member, So Cal.

I wired mine from the Ignition Switch Terminal which is active when the Engine is running. Ad an Inline Fuse Holder to avoid a Fire in case of choke Malfunction. You must use a switched source otherwise the coil in the Choke will never cool and activate as it is supposed to.

  

The I terminal is only energized when the starter is cranking.. I have the electric choke on my Holley connected to the + terminal on the coil.

Thanks guys. Someone recommended the I terminal. While I have your attention I'd like to bend you ear one more time. Where is a good spot to hook up an electric choke?

Durham Missouri