Nope, not cupped as far as I know, it came with the boat. And yes, I
believe this boat had a big block option.

So I drove down to the marina yesterday evening and did some WOT
tests.

3800 RPM's @ 36 MPH. It was increasing slowly so I think I could have
hit 40MPH @ 4000 RPM's. The previous owner would hit 38MPH top speed
but the fuel flow meter would indicate 1.9MPG. I was pulling 2.15MPG
and that tells me she had more left in her.

I thought I had posted I think it's over pitched. Now that I have
these numbers and plugging them into prop calculators I'm seeing a
16x14 should be the best option.

I'm going to give that a try when I get a chance. I think the engine
is working to hard to get up to speed. This would cause carbon build-
up, pre-ignition, and may even score the pistons and cylinders.

Dropping to that pitch should increase RPM's to the 4400-4800 power
band and the increase in diameter should help with torque. The more I
think about it the more it sounds like the thing to do.