mopar 440 that was put into a boat?

2000 hrs on a gas marine engine is alot. More then most survive. It's been bored once already. And like said, if it wasn't set up on FWC it's had salt water run through the block. Reverse rotation will have the knurling on the seal surface the opposite direction which will not seal. . Like anything they can be subject to neglect and improper winterization. Bit of a gamble.