Looking at the connections:
-top, right is the brake booster vacuum line.
-below the brake booster, slightly to the right of it, is the vacuum connection for the "U" shaped line from the PCV valve - you can't see the actual connection in the picture.
-top, left is the connection for the EGR vacuum hose. Mine as a second line tee'd into it, because I converted to a vented Opti. On yours, the 90-deg elbow from the EGR hose will go directly to the nipple on the intake manifold.
-below the EGR connection is a grommet for the PCV valve. The valve sticks into a passage that connects to the lifter valley at the bottom of the intake manifold.
This shows the line from the upper connection on the passenger side of the throttle body to the passenger side valve cover:
Shoebox shows the connections on the passenger side of the intake - vacuum for: HVAC, fuel pressure regulator, EVAP purge