All Classified forums require a Site Supporter subscription. It is only $25 per year and you can buy and sell whatever you like on the forum. To become a Site Supporter, go to Your Profile and select "Paid Subscriptions."
The Carburetor that you have is called a "Carter AFB" these Carburetor's are not made anymore. You can use any parts made for the "Edelbrock Performer" series Carb's... They do make an electric choke conversion, Made by Edelbrock that will fit right on the Carburetor that you have. http://www.summitracing.com/parts/EDL-1478/?rtype=10 If you wanted to run a stock Carburetor for the intake manifold that you have, the choke is controlled by a Bi-metal spring that bolts down to the intake manifold, it is controlled by heat from exhaust that flows through the exhaust crossover portion of the intake.