A friend of mine head a '93 with a HP465 with the extra long K tabs. The boat was good for only about 64 MPH under ideal conditions even with a pretty high x dimension. Perhaps it was the long k tabs or that the engine had about 250 hours that made it a slower then I would have guessed. It ran pretty flat and had a nice soft ride but was exceptionally reactive to cross winds - 7' beam. The hull glass work was solid and competent but the rest of the finish work left a lot to be desired.
As it has been said, don't expect any help from Dennis at the factory if you decide to go forward.