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Hmmm. Good water flow out of the relief hole but the head gets hot?? Is the exhaust manifold somewhat cool? It almost seems like the thermostat is stuck closed, did you check it? Water seems to be getting into and out of the powerhead OK, so I would say that either the thermostat is stuck closed, or the water passage through the head is blocked/jammed with crud. Is this a fresh or salt water motor? How about temporarily removing the thermostat, reinstalling the cap and trying it out….
In any event, the head gasket should be replaced, have a super close look at those crazy passages in the head before reinstalling, post pictures also. I don’t want you installing a new head gasket only to have the same issue.
How about the thermostat gasket? Did you replace it? Keep in mind it could be that the little bypass passage in the thermostat cap could be plugged up as well…