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If you are looking for this number in order to register/title the boat, and the hull identification numbers are not visible, you may have to get your State to issue you a new one.

I had a similar issue when I went to apply for a title for my 1978 Outrage 21. The numbers on the transom were not visible. Don't know how Florida deal with this problem, but in Massachusetts the State assigns a new HIN. I had to trailer the boat up to Gloucester to have the Environmental Police issue a new number.

Per the attached link;

If your vessel is homemade or built before 1972, or does not have a proper HIN, contact the Massachusetts Environmental Police, 1-800-632-8075, to inspect the vessel. The inspecting officer will affix a state-assigned Hull Identification Number (HIN) to the vessel.

http://www.boat-ed.com/ma/handbook/boatnumbers.htm