we have been looking for a river boat all year ,and have narrowed it down to a couple boats ,48 'nautaline1974,twin 454's,it has a couple soft spots on walk way,rest of boat "looks" good,or a1979 44' gibson with twin 318's,[?] the same shape in the "looks" field. my questions are ,what do i look for in the hidden places,like for rot,and what ever else i should be aware of.both boats are about same price .need help .would there be much fuel savings between 454 and 318.any idea on fuel use at cruise,and what would top speed and cruise be .bob and betty,