Some questions. Was the head billed as "the good number" head or generic? Are you into the head for low money? You might not need to pay return shipping, talk to the seller first. ( don't send neg feedback / start a claim until they reply.)

If you are into the head right, it is usable and would seal as is but at the limit I'd use.

To make a better fix, sand blast / glass bead the affected areas. Be sure to plug all the holes in the deck , tape off the valve cover side to keep grit out. Clean all the grit out of the eroded areas, use metal filed epoxy ( JB weld type ) to build the areas up. Lightly sand the epoxy to make it level. This does work if erosion does not extend into the fire ring ( the steel band around the head gasket. ) Some of the epoxy is trapped between the head and gasket so it can't escape, any exposed epoxy is just there for the ride.

The best fix is to weld up the areas. This isn't as big of a deal as it seems for a high end automotive machine shop.

Can select thickness head gaskets be purchased for this engine? If so the 0.002" max can be pushed farther. If not, sinking the valves / increasing the combustion chamber in the head can be a creative way to make it work.