N/A hp/cube is easy. The smaller the motor, lighter rotator, more rpm, the more the HP. Bracket race maybe a different story. Big block, lower rpm, lower maintenance. My bet is a 900HP small block will not go 300 passes with nothing but lash and oil changes. Not to mention it would probably have less torque. Lets face it, the wedge big block head development is light years behind the small block stuff. That being said, they can run pretty decent. I'd love to have a 9000 rpm stick car. It's more work and $ than I can keep up with. Anybody that's a real power junkie uses boost. Variety is what makes all this stuff interesting.
Doug