[Charles]

It must be remembered that the purpose of the various option codes was to schedule the correct options to match the build order for the car. The level of smog equipment on a vehicle was a GM decision not a dealer decision. There was no box you could check to 'delete smog equip'. Rather it was part of how GM built a car for Canada or the US. IN the 1960's and 1970's the build standards were more liberal in Canada than in the US. For example the Ferrari Boxer was sold and registered for road use in Canada but US dealers could not sell that model from the Ferrari factory. If a big block 1968 car got the smog delete option then it was becauce it was not required. The smog issue was dictated by the government and the General was just following orders. The only part the dealer played was in often removing the smog equipment once the car was sold.