The Edelbrock #140535 E-Force Performer series 600 CFM manual choke Black Powder Coated carburetor is custom tuned to deliver the best performance possible with the Enforcer supercharger. Front and rear carbs sold separately. The Edelbrock #140535 is similar to a 1405, but is tuned specifically for use with the SBC TVS2300 Dual Quad Superchargers. The Edelbrock #140535 is for the front carburetor only. The front carburetor must be used in conjunction with the rear carburetor Edelbrock #140536. Several characteristics make the #140535 Performer Series 600 CFM manual choke Black Powder Coated carburetor an outstanding street performer. The first one is that metering rods are utilized to transition between circuits. The carburetor is unaffected by engine backfires, which means that there are no power valves to blow out, and the rods can be changed in seconds without carburetor removal or fuel draining. Secondly, the carburetor has the unique ability to "hold a tune", so once it is tuned, the carburetor stay’s tuned. What this means to you is that compared to other carburetors, the performance remains consistent and the calibration stays unchanged. The lightweight all-aluminum body features a two-piece body that resists warping and is compatible with gasohol and blended fuels. The simple tub-type bowls and rear-pivot floats all contribute to a carburetor that's reliable, user-friendly and is easily tunable for miles and miles of trouble-free operation.