That is the block that Muscle Motors was selling before they closed shop. There is at least one member on here who has one of those blocks but I don't recall his name.

I'm not familiar with the whole story but from what I recall the guy who owns Bulldog screwed a bunch of guys on blocks in the past. It was Buick blocks I think.

There have been multiple threads on here on these blocks so some searching should find a bunch of info.