Electric Choke

Holley's instuctions say to pick up a 12v lead from something simple like a constant 12v from say the windshield wiper motor, but don't conect to the positive coil lead which has different voltage while the car is running as opposed to key on only.
If you look at summit's site at look at the individual carbs, you can click on the little icon next to the picture of the cabs that says 'instructions".
It will open up a very detailed instruction sheet on how to set up the carb right out of the box and how to tune it one installed.
I found it very informative.