I bet that boat will scoot pretty good. My grandfather had an old Chris Craft cabin cruiser with a 318 in it. That thing was super reliable, never broke down. That boat is somewhere in Florida now. My uncle bought it and drove it to Florida from Maryland.
Sweet, my dad had a 1946 Chris Craft with two straight 8 cylinder engines. He said they were Chrysler engines. He would let it idle just to listen to the sound, he loved the sound of those engines!