A Carpenter Cadet Type B School Bus, normally built on the General Motors P-Chassis; built on the Ford Step Van Chassis as far is this unit in question is concerned, powered by the Windsor 302 cubic inch V8 Engine, and the C6 Automatic Transmission.

https://www.purplewave.com/auction/240605/item/EK4574/1975-Ford-Transit_Vehicles-Bus-Illinois