First off, Huge thanks to Tom @ Jet Boat Performance for the suggestion on the allen bolts. They worked perfectly as did the throttle bracket.
I took the boat out this weekend and finally got rid of the dead spot at 3200 RPM. It was all a timing issue. Now I seem to have hit a brick wall at 4200 RPM and 51 MPH. I know there is more left in there. I'm just not sure where to look.
1) What MPH should I expect out of a Jacuzzi YJ pump at 4200 RPM?
2) How much HP does it take to turn a YJ 4200 RPM?
I am not looking to go super fast with this boat. I would like to see 60 - 65 MPH with the Pontiac motor.
This is a very low budget project. Thanks to help from a lot of friends old and new, I am total out of pocket on this project ~$1000. I'm guessing that makes my $$$ per MPH ratio a hell of a lot better than most.