Back in the day when we found a block or a head that was pitted we used an epoxy filler. It's been so long ago now I don't recall the name of it. We would use a hand held bead blaster and a soda (baking) blaster to clean out the pits. Grind out some of the bad ones with some small stones. Even drill some small holes for the epoxy to grip to. Apply the epoxy to the pitted areas and let it cure. Then file it flat. Apply a little more if there were imperfections. When the head gasket and head are bolted on it would hold the epoxy in place and made for a good seal. Just an option to salvage an old irreplaceable engine.
