The vacuum to the Power Booster needs to be fed by a large line (like a 3/8" line) because if you plumbed the vacuum signal for the booster to the Ported Spark fitting on the carb it would take forever for the vacuum level in the brake booster to be restored after a major brake stop.
Follow the Pontiac Brake Engineers plumbing design when working with that brake option.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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