Probably long-buried in a land fill, along with a lot of other parts of your truck!

TVS is Temperature Vacuum Switch - this was a flatter circle made of plastic that had two vac ports on it. Inside was a bimetallic spring that opened/closed the through-path depending on the temperature it sensed. It just hung out there, with the vac hoses on it.

V Rest is Vacuum Restrictor - A thin plastic tube with vac hose on each end. Has an internal orifice. A color code described what size orifice was inside. Usually used to slow the operation of some vacuum-operated device, so it would not change states rapidly.

VRDV we talked about before.

Air BPV is Air Bypass Valve - I think this name and valve type was used only on non-computer-controlled Thermactor Systems (TAB and TAD were used on computer-driven systems). It was used to send air from the Air Pump to the back of the cylinder heads, or to the cat converters, or dump out into the air.
Simple versions of these were used starting in 1970 on cars, years before catalytic converters. Adding air to the cylinder heads near the exhaust ports increased the breakdown of unburned hydrocarbons. My 1970 460's had one, a vac line from the carb would tell it when to insert air, or when to just dump it out. The Air Pump, being belt-driven, supplies pressurized air all the time, whether it is needed right then or not.

 

This is the pic of a vacuum "Christmas Tree", mounted on the upper firewall. It is a vacuum distribution point, one hose would bring up manifold vac from an intake manifold port, the "tree" would distribute it to other manifold vac users. I think it would take somebody with an unmolested '82-83-84 vintage to tell you what is Supposed to be hooked up there.

 

ok thank you, right now they all connect to the vacuum fitting on the rear of the intake. This stuff can be such a nightmare.

 

I replaced my manifold with one from a non-thermactor, the new manifold was the same overall length and was a great fix for my horrible leaking exhaust. New dorman was around $100 I think, was a year ago....just an option

 

that is most likely what I will do, but that only solves that one specific problem. I have a nightmare of other vacuum lines as well. Any thoughts on those. Especially the ones behind the carb that have 2 or 3 open ports that are not plugged. I think those are VCV's

 

I have a non-factory Holley, makes it simple...