Well, the hot air intake on sammys used a tube that runs from a T on the intake... one side runs into the fender (main air intake) & the other sorta looks like a clothes dryer vent hose (except ~3" diameter) that ran over to the heat shield on the exhaust manifold. If that tube isn't there then your hot air intake is gone.
I'm not 100% certain that's what that valve does... but I think it is. Here's how to tell: Follow the vacuum lines, one should go to the intake (or carb base) & the other will go to a vacuum valve at the T on the intake tube. If one goes there... then that's what it is. I have a Tracker, not a sammy so I can't just go look, but I've had several carbed vehicles that had a similar setup... & not 1 of them ever had a working hot air intake. Maybe one of the sammy guys will chime in & confirm or correct me.