Exhaust manifolds.

Have them resurfaced, Clean the head surface and install them without gaskets. That is the way they came unless you are using the heat shield on the drivers side which is not needed with today's wires and wire covers. Make sure they fit against without hitting protrusions on the block or head where those areas may need to be ground down so they fit flat. I never use gaskets on Manifolds Just something to blow out and leak.