This carburetor is available in a variety of configurations for street, strip, and track performance. The vacuum secondary helps heavy vehicles with automatic transmission performance, street gearing, and engines built for low-end horsepower. It includes an electric choke which is designed to supply a rich fuel mixture to the engine for cold starts and drive-away conditions and the screw-in air bleeds offer precision tuning capabilities. It also comes with all necessary vacuum ports for easy street vehicle installation.