From Edelbrocks web page
Manual Choke
CALIBRATED FOR PERFORMANCE
Designed and calibrated for optimum street performance in small-block and some big-block engines. Match with a variety of manifolds that include Edelbrock Performer, Performer EPS, Performer RPM, RPM Air-Gap, Torker II and other brands of similar design. Includes both timed and full vacuum ports for ignition advance. Electric choke #1478 can be added if needed. Comes with: Metering Jets Primary .100, Secondary .095; Metering Rods .070 x .047; Step-Up Spring orange (5" Hg). Use our Carb Stud Kits #8008 or #8024 if needed, see Installation Items. For auto trans throttle lever adapters and more, see Tuning Accessories.
600 cfm, square-flange, manual choke (non-EGR) #1405*
Surf it baby!