Where can you find a 1960s model ford pickup with a diesel motor in it?
Diesel engines were not a factory option until the late 70s, so if you find a 60s pickup with a diesel, it has been switched after it left the factory. Installing a diesel engine in a 60s model Ford pickup would not be the easiest conversion, but it could be done. Motor mounts would probably have to be fabricated, and you would probably have to change out the transmission, also. Best to find an engine/transmission combination that has already been proven to work together. The other consideration is finding a diesel engine with the horsepower and torque necessary for the truck.