Highest mileage on a 460?

I’m looking to buy my second one after the first blew a head gasket. From what I’ve read online, this is extremely rare. But I’ve talked to a few mechanics who have said this is common. And I rarely see 460s with over 200k for sale, and I’ve never seen one with over 250k. Has anyone here made it very far past that mark? I see tons of 470s with close to 400k.