A lot of head gaskets have the part number stamped into them. Should be able to tell if the gaskets are GM or Fel Pro or something else. Those look like some type of a rivet holding the center cover in place. May be able to drill them out or use a cold chisel on the sides at the bottom to lift them a bit or make a dent or depression so that you can get a vise grips or something on them. Best would be to remove them without destroying them so they can possibly be reused, otherwise dont know where to get a replacement. It seems maybe I have seen a similar fastener on the bottom of a small block Chevy intake manifold. They have a tin shield in the center to keep oil off of the crossover if I remember right.
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