a trainer and driver’s education instructor at the university that was employed by the school from the 1950’s well into the 1980’s claimed that he was very familiar with the chassis and that he had, in fact, used the chassis as a teaching tool starting in around 1957. They used the chassis for decades until sometime in the 1980’s.
http://www.fordbarn.com/2015/01/21/the-1940-ford-cutaway/#more-849