I am considering the purchase of a 1977 Mariner 33 but I have a few questions. For some reason there are 3 of them for sale in my immediate area. All for $3,500 or less. First of all, are there some big known problems with the 1977s that they are so inexpensive compared to other Carvers? With proper maintenance is it likely that the chevy 350s are still in serviceable shape? Most importantly, does anyone know whether the hull (below the water line) was still solid glass core or was Carver already using balsa core in 1977? That will be the deal-breaker for me. I can rebuild the interior and rebuild the engines, but I don't want to get involved with a possibly soggy balsa-cored hull.