Here is a Dyno sheet from John Sheldon aka "ROTARYJOHN" here on BRF. He has provided almost all the info here so far.
CLICK & go to "FULL SIZE" make it bigger.
I read it as 313hp propshaft & 10500rpm. (without nitrous) I think that if you add nitrous it adds 30%.
BUT thats only half the story. As Charlie Strang said, NEVER BUY AN OUTBOARD ON HORSEPOWER ALONE. TORQUE in the key and the ROTARY had that in abundance.
Many thanks to John Sheldon aka 'ROTARY JOHN' on BRF for providing the above literature.
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