Designed and calibrated for optimum street performance in small-block and big-block engines with Performer RPM, RPM Air-Gap and Torker II manifolds and with Performer manifolds on large cubic-inch engines. Includes both timed and full vacuum ports for ignition advance. Electric choke #1478 can be added if needed. Comes with: Metering Jets - Primary .113, Secondary .107; Metering Rods - .071 x .047; Step-Up Spring - orange (5" Hg). Edelbrock Performer Series Carb 1407 750 CFM - Square Flange Manual Choke - w/o EGR - Includes Primary Jet-.113 - Secondary Jet-.107 - Metering Rd-.071x.047 - Dual/Small Single Plane Intake - Street/Hi Performance UsageBurnished AluminumGM/AMC-Style Throttle LinkageCan Add Electric Choke PNEasy Tuning with 2-Piece DesignSmooth Secondary TransitionBoth Timed and Full Vacuum PortsIncludes PCV OutletPit Stop USAoffers Edelbrock Performer Series Carb 1407 at low everyday prices. Be sure to check out all of the products from Edelbrock including Edelbrock Fuel System and Intake Parts and Accessories, Edelbrock Carburetors, Edelbrock Gasoline Carburetors, Edelbrock Carburetors, Edelbrock Performer Carburetors.