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No there is not a copper gasket or O ring on the top of the head hex plug. One on the delivery valve.

Don't know where your leak might be but when I work on one with any kind of HH leak I cut off the tin fireing order plate that just lays on top of the HH. Then it is so much esaer to see what and where. The plate is there for nonmechanical people.

Yes there should be more in there and it is fitted to that pump.

Yes you can take out screw/spring/valve just watch and work. Or just back it out a little and retighten.

I believe from the one I have done that the head can be bad and replacing is the only answer.