The one on the front metering block is for the dizzy. The ports on the base plate have full vacuum for pcv, brake booster or other accessories that require full vacuum.
Fat fingered from the phone-Corey
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72 Malibu-Built 468bb, turbo 400 w/ shift kit & 3000 stall, 12bolt eaton limited slip locker 3.55. Rocking the bench seat and rally rims.
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