I'm right around 500/500 on 93 octane right now. That's the beauty of the twin screw, torque is right there with the HP. I'm running 11psi of boost, if you keep it at 8-9psi it will be around 450rwhp and on the safer side for a stock block.
This kit looks awesome. I don't know why anyone would even think about a Vortech when they could have this. I am thinking about one very seriously if I decide to purchase the an 06.