1966 Barracuda Formula S Choke ?

If its an oem carb, you might have some problems putting an electric choke on it. I would look at a late model edelbrock afb choke kit, and carb and see if there are mounting bosses which line up with your carb, if so, then yes it might work. You might also consider installing a manual choke, kits for these are pretty simple to install and cost a lot less than an electric choke kit.

Or, you could do what I do and use no choke. My cars don't get driven in cold weather so its not really an issue for me. I just feather the throttle for a few minutes until the engine smooths out and its good to go.