I just went out and looked my 1986 2.9. The PCV valve has a large nipple for the PCV function. The small one was plugged off when I bought the valve new. They make these PCV valves fit more than one application, some applications do use the small nipple, several of my different engines don't including the 2.9 I have. When you buy them they are usually plugged off with plastic, and if you need the small nipple you have to cut the plastic off like you would for a caulk tube.
I was looking at your video. I don't understand what that line is for that comes out of the fitting, loops around, and goes back into the intake behind the IAC. I went out and looked, my 1986 doesn't even have a vacuum port toward the firewall behind the IAC.
I am assuming on the forward vacuum fitting, that rubber line you have wire tied to the air intake hose goes over to the MAP sensor? Does the engine stall out when you unplug this line? And the reason I ask about that other line looped, I can't tell where it goes or what it's for, but I have found when I start messing around with that vacuum fitting that the MAP sensor goes to, adding stuff to it, it will seem to starve the vacuum to the MAP, causing it not to run correctly.