Depending on how your pipe is tuned, the 8, 8.5 and 9 pitch props might be just too much prop for your MVVS. It would be interesting to see what your motor tachs with a standard 9x6 and 9x7, as suggested by philly and jlong. Those and the 8.75x7, should be in the ball park. I would think you could get 115 mph with a 9x6, since we nearly there in the APRA class Q500 with TT40's.

I know its counterintuitive to suggest less pitch for more speed, but I don't think the 9 pitch prop will help, if the motor is not up on the pipe.

Paul