Picture 1 - A vacuum control valve is linked to the upper control lever and routes vacuum to the fresh/recirculated air doors and the compressor switch depending on the mode selected.
Picture 2 - While you could connect each vacuum line directly to the ports on the vacuum control valve, the factory used a rubber harness connector. It has 3 short sections of steel tubing pressed into holes in the body of the connector and the vacuum lines connect to these steel tubes. the other side of the connector fits over the ports on the vacuum control switch. Using the harness connector makes it harder to mix up the vacuum lines and there is a rubber tab that was glued to the top of the valve to keep the connector from coming off.
Picture 3 - The vacuum control valve Port 1 (at the rear) connects to the vacuum tank. Port 2 (middle) connects to the compressor switch (the switch with the black diaphram at the back of the control assembly). Port 3 (toward the front) connects to the fresh/recirculated air door actuators.
Picture 4 shows the routing of the vacuum line to the fresh/recirculated air door actuators. The inset picture shows a Tee connector (on edge and hard to make out). The line coming off the center of the Tee goes straight forward and out another grommet through the upper firewall and goes to the fresh air door actuator.
Picture 5 - The vacuum line going to the fresh air door actuator. A large blob of sealer seals it to the firewall.
The '69 cars have a more complex vacuum system, including an additional vacuum control at the defroster distributor and a vacuum controlled heater core shutoff valve.