Generally speaking, a clear state-issued title is an indication of a clear title only; nothing more, but possibly less. Usually, the title will not contain any historical information pertaining to salvage. Therefore, if you have some concern that a boat in which you have interest in purchasing may have some issues, then ask the seller/owner point-blank about those concerns and/or issues. In the alternative, prepare a statement that includes language specifically stating that the subject boat is not a salvaged boat and ask for the seller/owner to sign it.
Also, it is not necessarily true that a lien against the boat will be recorded against the title as well. Therefore, it becomes the duty and responsibility of the buyer to do his own "due diligence" to ascertain free and clear against the subject boat. This may include, but is not limited to checking the town hall of the seller's residence, the town hall of the boatyard in which the boat may be winter-stored, the marina at which the boat is berthed in season, and the state UCC office usually located in the state's capital city, for any recorded UCC filings.