I've been following the thread for quite sometime now and find it very amusing.
Some danish dude claimed 638whp and 512nm on a 4ag with stock internals. Though they're tight lipped about their setup apart from the stock internals, which I would do the same given the the $, R & D and white hair involved, its obviously that they're running very aggressive cam profiles..lots of revs, boost, trick fuel and good tuning, you'll get good numbers. How long will it last is another story altogether.
Here's the run.
YouTube - 638hk
Here's a souvenir from FF&R Jamboree 09 btw.
I'm sure you guys based in Australia knows who has this engine.
cheers