Good stuff.
I got 3 quotes from various landcruiser shops. Two quoted $15,000 and the third quoted $30,000.
All said and done I spent around ~$10,000 in OEM parts for the rebuild and several weekends of my time.
This sounds like a rod bearing knock. My engine sounded very very similar but the only way to verify truly is to tear the engine down. Mine had minor scoring on the bearing and crank, probably could have lasted a long time like that but would eventually fail. I ended getting a new shortblock...