For starters,

I am sorry that I am totally new to this "Jet" world, but I am learning every moment I got.  I work in the aftermarket performance world, however that is centered around drag racing, engines and tuning.  So all of this "Jet" stuff is totally new to me.   

Anyways, I have a boat that was actually featured on that Sunday morning TV show called "Engine Power" if any of you ever watch it.   I have a 540" BBC that made 688hp on the engine dyno.  The hull is a 74 Glencoe with a Jacuzzi WJ drive on it, and a hydraulic diverter.   

She runs pretty dang well, however, I have a few questions/concerns. 

1) At idle, there is a "rattle" or harmonic that comes from the drive area...is that normal?
2) Is this pump just a terrible idea for the power level this engine is at?
3) What would you all do if you had this thing? 

I have rode in some other boats making similar HP or 100hp more, and they flat out rip your face off and take off.  (BBC's with American Turbines).... mines alright and it is fun, but nowhere near that kinda performance.   So hence why I am reaching out to learn. 

I am attaching a photo of the rear pump set up it currently has...

Thanks so much in advance!
Erik