Stoney,
A couple of things.
First, how did you do two weeks ago when I saw you out on Garden State North reef (and did you see my post with the pix of your boat?)
Second, here is a 23' SeaCraft for sale that has a 300 HPDI on it.
web page
Maybe you or your buddy want to reach out and ask the curent owner. I remember the previous owner said that it went about 50 MPH at WOT. I am sure that you have heard the debate about how good/bad the larger block HPDI's are. Many posts on this topic. I plan to drive my 200 HP OX66's for as long as possible. Whenever they go I will give serious consideration to twin HPDI's.
Lastly, are you still fishing? I pulled my rig out of the water late Thursday (worried about the canal behind my house freezing up). However, I am planning on another couple of tog trips between Xmas and early January.
Peter