[LMH]

By changes, I mean in the production of the leaf spring cars. To be honest here, I don't know as much about the coil spring cars as I do the leaf spring cars.
Changes were made throughout the entire run of Cobras. Some small and some more in depth. When questions arise about what exactly is "original", there's often no easy answer to that question. Changes were made based on feedback from SAI, from independents, Ford and internally within AC themselves. I think your question is more about SAI as a race team and race cars are a different animal. Even within SAI themselves, race cars were different from each other in some ways as they were prepared by different crews. In those terms, my guess ( and it is a guess) is that changes specified by SAI were major changes that AC did for a single car or group of cars that were ordered as race cars. Those were normally shipped with specified changes and usually unpainted.
Did I hit your question?
Larry