Chuck 'em mate, that pitting is way too deep for safe operation, sure, your forks might not leak, but that won't stop 'em from snapping if you hit a decent size pot hole.
Yeah I know someones gonna say they used worse forks on their bike and they're working fine, but for my two cents, I'd rather you erred on the safe side, and anyway, what's the point of fixing up a bike and putting those crappy forks back on? Cheers, Terry.