I agree with you on what you said above. But in 69 383 A/C,Automatic Used Holley Carbs #R4440(4160 series)
They did NOT use the Holley carbs in 68. They also used Holley in 1970 with the N/96 and N96+n95 And 71
I do not know why they did this. And I am not trying to argue with anyone as I am not an expert. I was told it was just A/C cars in 69, that used the Holley.