That is correct. The question is where do you take your vehicle to get it inspected? If it is a by the book sort of place they will fail you if you put the older engine in. If the place just does the inspection on face value they will not know the engine is older then the truck unless they check the engine numbers and know the coding. I doubt that they would take the time to do that other then if you brought it to their attention. Otherwise I agree with Jason, who is going to know?? BTW, 1995 and older vehicles don't have to pass emissions. It is just a safety inspection.