The brake vacuum comes from the fitting on the back of the carb. The Tranny vac comes from the fitting in the intake manifold just behind the carb, and the front left fitting as you look from the front of the truck is the ported vac for the dist., the middle port is for the PCV Valve, and the right fitting is either plugged or full manifold vac. I may have the left and right fitting criss-crossed, but I am sure someone will correct me if I do. The carb came with a fitting for the brake vac to fit the existing pipe/vac line from the booster to the carb. Do it right, not just so it will WORK.
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