I'm looking at an '02 Donzi 33zx out of Miami with 496 mag hos. I'm aware they're closed loop, should I have other salt water concerns? boat has 165hrs

salt air will infiltrate and corrode wiring ect.

Was the boat lift kept over SW, or rack/inside stored?

The FW cooling side should still have been flushed after use, is it your impression that it was cared for well?

Is the $ right?

As with anything else, how it was maintained is key. If flushed and washed with a product like salt a way after ea use and kept on a trailer or rack, it should be ok

It all depends on how the owner took care of it. I'd have a member take a look at it.