I have read up on everything I can find on the Kaase Boss 9 heads. Does anyone know what the port volumes are? Would they work good on a lower rpm jet boat (5000 rpm) with ci of 550-600? I would love to build a nice 545 or 589 with a cent supercharger on it. I have a 501 right now with Edelbrock's on it making close to 800 hp on pump gas. I would like to hit the 1000 hp mark if I could.