carb id numbers

Question for you carb geeks......I have two 69 383 big block cars. One came in pieces and the car has a number of 67 and 68 pieces so I know the car is not 100% factory. We are close to getting the puzzle put back together. In the boxes was a carb and it is G8 4682S Which I would assume would be the date code and 383 carb. Does the 'S' denote an automatic? Were the Formula S 383 cars considered HP 335HP? Perhaps this is the correct carb??? or should the car be outfitted with the 4616 carb....for a generic 383??

Last question - is the G8 a date code? I would think it might be G (7th leter, July) 8 for 1968 but......I can't find anything definative.....anyway....confused on the G8, if it was a date code I have another spare carb that is M1 - which would be for the 13th month of 1971 if that logic was true.....

Any insight would be helpful. The list of carbs is pretty awesome though. now if I could find the decoder ring for the other stampings...