Incorrect vacuum connections is probably the biggest performance problem I’ve seen in this forum. Here’s a pic of my vacuum connections during a rebuild before I connected up the smog pump, EGR, and EFE: If you want confirmation then Chiltons repair manual has several diagrams for each year and configuration:

How to Tune a Holley (basic) by Lars Grimsrud SVE Automotive Restoration Musclecar, Collector & Exotic Auto Repair & Restoration Broomfield, CO Rev. New 3-14-01 This tech paper will discuss basic set-up and tuning of Holley vacuum secondary carbs for optimum street performance and drivability. Overview Holley carbs have been used by hot rodders for […]