I'm a big fan of the magnum I'm running now, I bought it running for $500 3 years ago and I've been beating on it every day since, this block needs probably at least $500 of machine work so that's why I wouldn't really give it a second look compared to just going out and getting another running magnum for $500, they're cheap and plentiful and have lots going for them, compared to this rusty block lol
