... the air valve that comes out of the intake into the block, i saw you had that closed off. is it necessary i close that and why? ...
That is the one I mentioned in the Writeup as the E.G.R. System and is for engine gas recirculation.
I had to change the Heads on my "BumbleBeast" long years ago, those are the third gen EA82 Heads and those came from factory with that passage sealed; so the EGR valve at the intake was cap closed for being useless, for years; however, when I did the Weber Swap, I removed that EGR Valve and the closed pipe, because I don't want to have unuseful stuff on the Engine bay, and in that way, the intake looks cleaner.
Is it necessary? ... Well, the answer will depend on your area's Laws against pollution and what will be needed to stay in the car in order to pass emmissions; but that EGR design is unhealthy for the EA82, that is the reason why the Subaru Engineers removed it from the third gen Heads.
But if you want to keep it and make it work as close as it should, the front of the weber carburetor has two pipes that provides vacuum, the one on the Right side which is Progressive, is intended for the distributor's advance; while the pipe on the Left side, provides vacuum until the engine is at higher RPM's, when the Secondary (high) stage of the carburetor is activated; so it is intended to be hooked at the EGR Valve; you can run a 3/16" vacuum hose from said front-left port on the Weber Carburetor, to the EGR Valve.
The rest of the Openings on the Exhaust, shall be Closed, otherwise your engine bay will become Noisy from exhaust...