It's a heavy boat for gas motors.
Check for cracks and/or loose bolts around the prop struts. Will indicate extended use with bent props or shafts. Also insist on checking engine alignment. If engines are out of alignment, cutlass bearings will be shot.
Can't very well get to the tank to check for rot. Must tear up the floor to get to it. And if you go to that trouble, you might as well plan on replacing the tank with a plastic one.
You CAN, however, drill from the bottom up into the stringer to get a "core sample". If it's good glass it up and go. If it's bad, get a BIG discount or pass on the deal.
And pull the zincs out of the genset heat exchanger. It's amazing at how those can give insight to whether the boat has been sneaked into saltwater or if it has been plugged into reverse polarity.