Ok so I decided to go with a dome piston instead of heads that way I can go ahead a buy a roller cam aswell, now my question is how big of a dome do I need to reach my goal of 9.5 compression or close to it? With that compression I would need to run at least 91 octane gas right? Also what would be a good cam choice for me I will mostly be duning the vehicle so it will see a lot of WOT would be nice to reach or get close to 500hp thanks again......