Hey Bodie
Yes its a regular 8 valve head with Group 1 exhaust valves and slightly bigger than group 1 inlet's. If you want to know more about the head you need to contact Wozzah as he built it.
I was surprised with the dyno output too but keep in mind all dyno's read differently and there is a bit of variance also in how high the car was sitting on the rollers etc. Perhaps mine wouldn't read quite as high on a different dyno.
I would also be assuming less power train loss than 33% but i am not really sure how to calculate this properly.
All i really care about is laptimes and that gets tested at Winton next weekend!
G