Vacuum tubing schematic

So here is my vacuum harness. The previous owner cut the tubing at the firewall and removed all engine bay components. Schematic says the black tubing is engine vacuum.

1. What does the vacuum reservoir look like on a 74?
2. The green tracer tubing that passes thru the firewall goes to what? The water valve actuator? I assume this is under the hood?

firewall.jpg harness.jpg