I know folks will get all warm and queasy at the thought, but corrosion pits are routinely filled with JB Weld over in the VW community on their Vanagon WBX heads. I'm talking about pits around the entire perimeter of the sealing surface. I found a few similar corrosion pits on the first #14 head I pulled, and had I not of replaced it with a new #22, it would've gotten the JB Weld treatment. On this one, I'd either pay to have the pits TIG'd or JB Weld and coat the gasket with Hylomar