The line going into the firewall is the supply line for all the doors/ducting to work for A/C & heat.
The round(?) cannister is the reservior for vacuum system. I would probably hook up the pass line to full time intake vacuum and place a vacuum gauge on the second nipple of the cannister just maybe to see if this line would be continuous.
You could do a couple things, go to the central library and check out their reference books, look at another's car for visual checking, or visit a repair shop having Mitchell Repair CD and ask for a printout of the vacuum system.
If you have a hand vacuum pump, works great, this way you don't have to have the engine running all the time while troubleshooting.
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CUBS - 2016 World Series Champions - Thank you, Joe Madden … enjoy your next chapter.