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This is called the heat riser, it would be where the exhaust pipe would connect to the manifold on one side, when cold and closed it would cause the exhaust to divert through the intake manifold from one head to the other...

Yes you are good, no ports in the intake, just blocks it off anyway. This is left over from the old carburated gasser days, they would have a thermally controlled butterfly valve in one of the exhaust manifold discharge ports to cause an imbalance in the exhaust flow so it would cause some of...

Those are the exhaust to intake manifold heat ports, IIRC there is no matching port in the manifold so the exhaust has nowhere to go anyway so you should be good. I will run out and check a manifold