Pulled the valve cover today anyone ever see this stuff?

Could not tell you on that manifold. Certainly needs to be some vacuum through the PCV at idle. I am not quite understanding the 18-19 in vacuum at the V-A port.... is this with the engine revved? If at idle, that is not standard Mopar V-A.

BTW, I see a connecting metal bridge between the 2 intake halves, with what looks like a blocking screw in a threaded port. What is that for?