Sutphenman,
buy, a faster boat. Sorry, I didn't mean that.
In order of trial from you, try first a 4 blades prop.. Then install good manifolds. Then install a Holley 750 cfm, double pumper mechanical secondaries. Then add a good intake manifold. Whipplecharger or Procharger (I'm not racist) will also give you speed and will still make your engine last if you use them with your head.
Sorry, I don't own a Sutphen, but the hints are still good.