Check the VIN to make sure it is a real SD. The VIN should start with 73837. What is the build date of the car? Someone correct me if I'm wrong here. The early 67 SDs had a small block. The 396 wasn't added until later in the production run. Don is correct about the "Econo-Jet" decal. I have a set around here somewhere. I would contact General Motors of Canada for the info on the car.
James
James