I have a 540 inch big block for sale with less than 1 hour time only for sale that made over 650 horsepower. It has a Dart Big M block, Callis crank, manley H-beam rods, JE pistons, Total seal rings, Clevite bearings, Merlin heads, and a custom cam...$17,250.00 US
I have sold the boat without the motor and am buying a 30 foot baja to replace it.
This is a motor I built for my best bud almost 2 years ago. It has the same as the motor above except it has Brodix heads and a bigger cam and makes 758 horsepower.
Do a Google search..MotorsbyShooter and you will see the dyno sheet for this motor.