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I don’t think sealers are of much value or normally needed with a new head gasket. But when reusing one I would probably use the "Aviation Permatex" or something similar. With the increasing cost and decreasing availability of head gaskets there is obviously more temptation to reuse them.
Agree with NOT using copper-filled antiseize on aluminum. The aluminum flavor is readily available but its hard to know if it has graphite or other electrochemically active components.
One thing to bear in mind is that anti-seizes, whether metal based or teflon based, have a low coefficient of friction and can easily lead to overtightened fasteners. There is not usually warning of this on the container. Maybe it’s safer to use the OMC gasket sealer or the Mercury equivalent on threads?