Not good. If you change the head gasket, inspect the head closely. You could have a crack or a corrosion induced hole in the water jacket. It would be best to have the head pressure checked while it is off. If it has very many miles, like more than say 150K or so, you would be very well served to have a valve job including valve guides at the same time. This will make the most of your labor efforts.

Good luck with it.