[Fr. Frank]

Here is the actual wording of the applicable statute:

(2) ANTIQUE VESSEL REGISTRATION FEE.--

(a) A vessel that is at least 30 years old, used only for recreational purposes, and powered by the vessel's original-type power plant may be registered as an antique vessel. When applying for registration as an antique vessel, the owner of such a vessel shall submit certification, as prescribed by the Department of Highway Safety and Motor Vehicles or from a marine surveyor that the vessel meets the requirements of this paragraph.

(b) The registration number for an antique vessel shall be permanently attached to each side of the forward half of the vessel as provided in ss. 328.48 and 328.54.

(c) The Department of Highway Safety and Motor Vehicles may issue a decal identifying the vessel as an antique vessel. The decal shall be displayed as provided in ss. 328.48 and 328.54.

The definition of "type" of power plant comes from the title application form and lists fuel and drive type:

gasoline, diesel, or other, PLUS outboard, inboard, sterndrive, or other.

SO, if your boat was originally powered by a gasoline fueled outboard, and it still is, it meets the requirements of the law. But if it was originally powered by a gas sterndrive, and is now an outboard, it does not meet the requirements.