From past overall experiences I would steer clear of Jasper. There are several very good company's that deal strictly with marine rebuilds and/or new long block assembly's, one being the for mentioned Michigan Motorz & another is Marine Engines Inc. out of Mass. If your going that way I would both consider the difference in price between a new vs rebuilt long block & also stepping up to a 5.7 over the 5.0 while your at it.