the add could be deceptive on purpose. get better picks or view in person. check transom & stringers for rot. soft spots on floor generally indicate rot below that is 100 times harder to replace than the floor.
if the boat mfg date is post 1972. and US made. it'll have a hin on the transom somewhere. the first three letters can id the boat mfg. the last 2 digits will id the year.
