I can't find a site with the specs of the Mamba 8000 (rev/volt), but it seems to be a high rpm motor.

For use in a small boat, the high rpm and the small prop that comes with it could cause more cavitation than speed.

Look at the Gecko hull at www.mhzusa.com , this epoxy hull can take the power of your motor and stay in one piece.

Another very suitable option is a rigger from Climate Models, riggers need high revs and are the fastest electrics around.
Downside is that riggers don't handle chop very well, but man, they are fast!

Regards, Jan.