Electric choke wired to coil?

Jr has a good point. Many of these cars suffer from HARNESS VOLTAGE DROP, which can be caused by one or more problems, the top suspect being poor connections in the bulkhead connector.

IN my 67, when I got it, there was ONE VOLT drop in the ignition run (blue) going to the regulator/ ign system

Using a relay to power ALL ignition run loads is a good idea if you cannot run down the drop, and even if you do, it relieves the strain on these components.