Going back to your original post.....

919 is the standard C body 375 horse assembly code with A/C for 1969.

That question has been answered by the documentation provided.

Beyond that, it is up to the “experts” to provide additional documentation as to any special cam grind, requirements, specifications, reasons,, etc for 1969 CHP cars.

Ask them about details, copies of specifications sheets, bid requirements, or to provide copies of documentation.

Until they provide documentation, it’s a great story; but unsubstantiated, unproven and an urban myth.

“Trust....but verify”