We have owned a 1972 F36 for 20 years and love it. Ours was the first year they made them in fiberglass I'm told, and heavier with a thicker hull. We have done many modifications to the interior and the previous owner repowered with Cummins 555 turbo diesels. They are heavy by modern standards and only put out 270 hp. That is good for an 18 knot cruise speed at about 1 mpg. If you have any questions ask away.