Is there a way to see how many cudas by year were made with certain options? Like ac
This is the question that the entire hobby wants to know (to one degree or another), many people are attempting to make money trying to answer, and yet others are attempting to profit by insinuating a specific car is "1 of X" due to whatever is on the car.
The truth is that outside of the model, engine and transmission the rest is for the most part a guessing game. Glovier and guys like him have built a career on seemingly have the "secret" numbers and thus like to say this or that however it is known that Mopar did not keep those records and if they did they were destroyed/lost.
Its a "catch 22", they cannot prove anything because if they actually had real evidence and provided it their business would suffer eventually once the numbers were known. Subsequently you cannot prove they are wrong either so we end up with paying dudes like that to write a letter saying one thing or another. On that note you will see that in his letters he typically includes the phrase "known to exit" or "currently in the registry".
The vast amount of this numbers game is achieved through extrapolation meaning that if a 70 Cuda represents 3% of the total production (making this number up) and there is evidence that Plymouth installed 100,000 AC units in 1970, then it is reasonable to assume that 3000 Cudas got it. No idea if this is real or accurate but it is the number that then becomes "fact".
The problem comes in when attempting to identify a "1 of X" number which requires that everything about that car has to be extrapolated (seats, interior color, seat material/design, stereo package, etc.. all options) and then all of it in total has to be weighed against the cars known to exist. In other words, it is generally not just one item or option that makes the rarity of the car, it is everything in total. So you could have one of the 2000 Cudas with air but if you had the deluxe stereo, pumpkin interior, rear defroster, deluxe wheel, etc. then the 2000 number gets much smaller much quicker.
This issue is one of the reasons so many people get all up in arms over getting a fender tag made, because the majority of the options are bolt on and exceptionally hard to prove originality thus those with broadcast sheets and fender tags are worried that the value of their car will be diminished by someone "making" a car that wasn't born that way.
Sorry for the rant... kind of one of my pet peeves, I believe that people have somewhat ruined the hobby with the obsession over originality and the near homicidal anger that comes out any time this issue comes up.