What you need to do is know the specs of the components you are going to use (cam profile, compression ratio, bore & stroke, etc) and determine where the powerband for your new setup lies. I doubt that you will be building peak power at 9K rpms. As with most engine setups, once you pass your powerband, the horsepower and torque are going to drop dramatically.
If you're just wanting to be able to rev to 9K, then you will need to choose components that are designed to operate at peak power at that rpm. Otherwise, build the engine for the powerband, no matter what the rpm, and go from there. More rpms doesn't neccesarily mean more HP.
Just my $.02...