The book "Wings of Cessna" by Edward Phillips, tells me that a total of only 194 if the model 336 aircraft were ever built, which was from 1962 to 1964. In 1965 the 337 with retract gear was introduced and the 336 discontinued. This makes the remaining model 336's fairly rare and I suspect that Bill should ditch all of his assets right away and buy the 336 to preserve it for the future.
The book also tells me that some subtle but important changes were made with the intro of the 337, such as the angle of incidence of the wing being changed by 2 and one half degrees to improve inflight visibility over the nose, the airplane sat 4 inches closer to the ground, and thus the bottom of the vertical fins were shortened by six inches to avoid ground contact on take off and landing, elevator chord was increased by four inches to improve pitch authority, and the rear engine cooling scoop was enlarged.
Charles
