Throttle body to sensor(?) in air cleaner vacuum line question

Quick question for those with much more knowledge than me....

We're talking about my '72 Newport with the 400 and original 2210 carb. So, I've done a bunch over the last few months and have most things sorted out to make this a fun summer car and it has gone well. It has been running like a top so I took it to Mount Desert Island here in Maine last Sunday (about 200 miles round trip) and it drove beautifully. Parked it and fired it up two days later, no problems initially but got to the...

Throttle body to sensor(?) in air cleaner vacuum line question