67 AC systems are similar. If I understand your request correctly, you need clarification on which lines have vacuum per function. See the table to the left on the 1st photo.
With regards to the dual port vacuum motor, this may help wrt a perceived bleeding from another user's question:
"Vent or Out" applies vacuum to both Vacuum Motor nipples, pulling about 7/8" against the spring and opening the Air Inlet Door for 100% outside air.
"Inside" applies vacuum only to the outside nipple. It only moves the Air Inlet Door about 1/8" to meet the 80% recirculated/ 20% outside air. If this malfunctions, you'll get 100% recirculated air.
If your new vacuum motor is bleeding from the outside nipple and cannot hold it's position at 1/8", it may be defective. I have two original vacuum motors and bench tested them to the conditions above and did not see any bleeding. I've attached pictures of the measured positions.
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