All great info! Alec, you were spot on. I swung by the local parts shop and grabbed a few extra feet of vacuum line just to keep in the glovebox. I was able to old, crusty tip off of the banjo bolt very easily and replaced it in about 2 seconds.

Last night I started the car up for the first time in a little over a week. Seems to run better. Could be the new vacuum pump, or a few of the other broken vacuum lines that ended up getting replaced as I found them. Coincidentally, the car had struggled to turn off if it hadn't been running for long and now she turns right off. Accidental repair :-)