I google electric choke they talk about a vacuum hook up for cooling of coil in choke did I read that right? Thinking tapping into HEI 12 volts there no resistor inline dropping voltages also read wouldn't make a different still should work. Vacuum cooling has my head spinning also looks like that electric choke is always heating using electric power. what would it take to convert to manual choke?
The vacuum port was used in conjunction with the electric choke. It was hooked up to a heat sink in the exhaust stream and was designed to augment the electric choke. Here is a picture of one designed to install in the intake.
standard Ford set up with the combination of electric and hot air.
As for the HEI, you can either bypass the ballast resistor (it is on the firewall) and wire it directly the original dist wire, or you can install a relay and run a heavier wire from the battery straight to the dist. (which can be used to run your choke as well). The HEI likes more power, however, I have seen many hooked up using the original wiring and they ran just fine.