When I opened this I thought this would be the issue with the hole running into the deck from the WP not being machined all the way through, which only the earliest blocks had. Should have been cleaned up by '09 though.

You didn't need to know that, but I just wanted to be honest because I am very familiar with that issue/seen it a bunch of times, but I've never seen quite that much casting flash in the lower holes

I'm with Scott, and I would want to clean that up but proceed with extreme caution.