I doubt they are as deep as you think, I have had 2 blocks that looked like that. I took a 70 grit dry sunnen hone and and opened them up till they were gone and the worst was .020 and they looked worse than yours.
.020 might as well be a mile. That's a bunch. Of I'm reading this correctly, you took .020 out to remove the pits. At that, I'd have left them in there.
