I cannot talk about this model as I am not familiar with it but have not seen anyone complaining about it.
Just look for the typical stuff, boat condition, engine running condition. Check engine temp with a IR thermal gun including the exhaust system. All should be less the 160 F.
Check gear lube for signs of water.
Good luck and let us know if you get her.
1997 2400 SCR
5.7 Vortec / Bravo 2