750 CFM - Mechanical Secondaries - Black - Gasoline - Electric Choke. For drivers who prefer a direct connection, the mechanical-secondary 750 CFM Brawler Street in black with red billet components pairs bold looks with serious performance. Electric choke convenience meets four-corner idle precision and contemporary calibrations, yielding crisp off-idle, muscular mid-range, and a clean high-rpm charge. USA-assembled and highly tunable, it’s a durable step-up carb for strong street/strip combinations.. This model of carburetor has the square bore flange bolt pattern. It can replace Holley, Edelbrock, Carter AFB, and Autolite style carburetors with 5 3/16" x 5 5/8" bolt pattern. If you have a spreadbore style intake manifold, you will need an adapter to install this carburetor. Similar to.