i assume the cutoff for choke is just a good safety step. remove a hot wire from a supply of fuel. plus a length of wire that could pinch chaffe short etc.
Seth

"I understand why the fuel pump cut-off is a safety feature (in case of collision, etc.). But don’t get why continuing current to the choke would be, other than running down the battery (?) Would it possibly ignite gas fumes? If so, that would make it dangerous in normal usage situations, and thus not a common feature."

It is a safety feature.

I posted the wrong schematic (the correct one will not upload for whatever reason).

Study the schematic without the oil pressure cut-out switch and that will isolate the coil circuit away from the IGN circuit.
You don't want to overload either circuit running in an older IGN SW/wiring system and you don't want the choke drawing power from the IGN circuit, especially after having gone to electronic ignition.

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I assume the same would apply if the connection was anywhere on the same the ignition switch ‘running only’ circuit/pole that powers the coil. Other accessories that only function when the switch is in either ‘acc’ or ‘ign’ positions must have a similar ‘resistor’ effect (including the proposed relay), though in relation to their current draw.

6 VOLTS/POS. GRD. NW INDIANA

6 VOLTS/POS. GRD. NW INDIANA

The reason you do not use the positive side of the ignition coil as a voltage source for the choke heating coil is that the choke coil will act like a resistor for the ignition circuit.  By the choke coil acting as a resistor when hooked to the ignition coil, the voltage will be reduced for both the ignition coil and the choke coil.  Just how good your ignition circuit is initially which also includes the spark plug gaps, will determine if the overall performance of the vehicle will be affected if hooking up the choke coil to the positive side of the ignition coil.

Lorena, Texas (South of Waco)

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6 VOLTS/POS. GRD. NW INDIANA

I have had my 12 volt Holley electric choke wire connected directly to the hot side of my 6 volt coil for many years and have never had any problems.  

That is the best schematic I could find ,,,

It also includes a circuit to shut-off the electric choke or an electric fuel pump if the engine shuts off. Just concentrate on the basic install.

I have little experience in 6V so you will have to find wire gauge and fuse values on a wiring site.

Did you call about the 7V cap?

BTW - What CARB are you using (FORD or HOLLEY) and if a take-off does it include the choke housing?

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6 VOLTS/POS. GRD. NW INDIANA