Welcome to the forum Charlie, Aaron Wilson is the “rain man” of sporty engines. He won’t steer you wrong. To make power on a 9 motor requires it to be built a little different than the 12. I’ve wasted a lot of time and money on my 1169cc motor by building it the wrong way. HAMMER PERFORMANCE has my top end as we speak. They are good people for sure. I also recommend an Energy One clutch for an upgrade. Fantastic clutches. I’ve already been down the road that you are heading down. If you have any questions let me know. I’m here to help!