Pictures appear to show the boat is in pretty good shape. I have a 95 and love it. I would find manifolds as others have mentioned and take it to a reputable machine shop for an engine refresh. New seals, gaskets, rings, bearings, oil pump, deglaze the cylinders, valve job, etc. There is excellent support for that engine on CCFan and PlanetNautique and you should have no issues getting it into tip top shape.