Interesting and thanks for sharing but when 'experts' are incorrect, it just causes more confusion in the hobby.
The point of the post is an example for today's "Experts" That numbers matching is much more important than it was back in the day. Some are obsessed with that mission.
I have had discussions in the past on this issue. Some even heated. That this mission has somehow clouded the very essence of muscle car appreciation. In the day we were not at all concerned with "Purity." It was how much performance thus appreciation one can get with their own efforts from their own hand. And garage.
Don't get me wrong. I understand the dedication and skill it takes to restore to all factory conditions. But I also remember why we first loved these cars. And it's not to create art. It was to push one's own talents in pursuit of performance.
This of course is just my opinion. And many will have very legitimate disagreements.