I do believe there was a change and this seems to be supported (with no definitive date) by the information on Mustangtek. I have been talking to several people and it seems like the change over occurred sometime around December 66. However, I still have a couple of questions.
First, would it be more accurate to use the engines build date, or the cars build date?
Second, my serialized date was 11/22/66, my scheduled build date was 12/2/66, but actual build date was 1/4/67. What would cause such a gap between scheduled and actual dates? I have talked with another San Jose S code owner whose Scheduled and Actual dates are both 12/15...according to Marti.
Lastly, when determining a change for something like an intake, would it be more likely to use the engines build date or the cars build date? Similarly, as I try to correct things on my car, it looks like the few items I have tried to address had changes right around my cars dates. Is it more appropriate to use the scheduled or actual date?
I suspect the answers will be it depends, but was curious on others thoughts. Sorry for newbie questions, but I need to start somewhere.