Having an impossible time decoding

I have 2 64s and for the early As (I think the cutoff is pre 67 but I could be wrong) each plant had unique fender tag mapping to Chrysler sales codes. So, for example, a 3 under the 'A' for the LA plant might be mapped to the 64 engine sales codes but for another plant 'A' might be mapped to the 64 transmission sales codes. I have Galen's book which is helpful a lot of the time (but not always especially for Newark DE plant cars like one of mine). I'm on the road right now and won't get home until tomorrow night but I'll gladly take a look at what it shows for your tag when I get home and send you the details.

Also, it would probably be a mid-year car as I thought I read/heard somewhere that the 273 was released half way through the model year as the first V8 option on the dart.