I haven't been around mud for very long so forgive the ignorance but... Who's Robbie? Sounds like someone to get to know.
Robbie Antonson is the Technical Editor of Toyota Trails and has a shop in Boulder, CO. He also travels a lot building Land Cruiser engines (well, he did at least for a bit). He was with Slee Off Road for many years as well before going on his own. I'd say Robbie knows his stuff and has probably built more 1FZ engines than anyone in North America.