I have the factory docs on the wire clip somewhere, it may take me awhile to find it though. Lets not forget that the 69 440 cars were built from the allotment of 383 cars, just like the 68 Mr. Norms GSS cars were taken off the 383 line and an "M" code VIN attached to the dash. If you take the number of big block automatics built, which is 1128, then subtract the 488 true 383 autos built, that makes 640 proportedly built 440 GTS's. Once again this means that they started life as 383 cars, and the line needed to know that all the 383 components MUST be in place before convertering to 440 power, it makes sense then.