RPM Airgap

That's goofy.
Your intake is not sitting down far enough. Ima guessing it's sitting on those little sticky-out thingies on the ends of the head gasket that line up the intake gaskets and clamp down the end seals. Cut them off and try again. The intake must drop down into the valley and both sides must contact the both heads,and it must not slide transversely on the china-walls.