Who wins the battle to build an A833?

Agreed. @gagembassett, haven't you read what Passon did to our member @matthon? They screwed him over so badly that I felt his pain. I hate to disagree with @abodyjoe, but the problem with Passon was not that the A855 had problems, it has how they refused to own the problems their transmission was causing Matthon and make it good. I would definitely go with Brewer for a stock rebuild, but with 600HP, I think you are going to need more than a stock transmission. Did you tell Brewers about the 600HP?
yessir had a full conversation about it with Dan Brewer. He said with the proper clutch setup ( i.e. a clutch tamer, centered iron disk, soft loc, and pressure plate set up correctly. Also said to call Cale at Black Magic Clutches for help) that it would hold behind 700 hp