The code I am talking about is on the toe of the carburetor, that is the accurate way to tell what the carbs ID is, Even if it has been changed (yes some unscrupalous people will change this number for you) you can tell .
On pre 65 number it is the 3rd number in So for example C5ZF-XX the Z indicated mustang, C4SF-XX the S indicates Thunderbird, C3AF-XX the A indicated Big car line.
On 66 and up Ford eliminated the redundant or obvious number to save money so the decade code and the engineering code got eliminated, so a 66 carb would read 6Z-XX for a 66 mustang, 6A-XX would be a 66 galaxie, 6S-XX would be a 66 thunderbird,
In later years it takes more sluething and knowledge of carburetors for example 8Z-XX would be a 68 mustang 3Z-XX would be a 73 mustang, but 6Z-XX could also be a 76 or as we have seen a 66 mustang but since ford quit building 4100's in 66 basically and the last 2100 was around 73, if this was a 2150 one coould easy deduce that it would be a 76 carburetor. With a little knowledge of what carbureto got installed on a given line with the part number it is easy to see where the carbs and correct numbers fit.
What you are see when someone mentions it as an "A'Code mustang is the A engine code on the vin number, ford during the 60's had many different engines of various tuning and different horsepower ratings, The A code designates a certain engine/horsepower rating depending upon the year. Of course then that also translates to differing heads, intakes, compression and carburetor requirements. The A code mustangs are usually the entry level performance V-8 engines, they usually had a four barrel with two barrel or non-highperformmance heads, and modest compression.
With ford in the 60's the lower the engine package usually the more popular the car, since most people during that time did not step up and order higher performance equipment, crazy isn't it.
Of course that is what makes a Z code or a G code or a S code or better yet an X code vehicle so desirable today For thsoe not in the know A Z code was generally a 320 HP 390 GT, G code a 405hp 406 tripower, S code 390hp 390 and a x code is the infamous 427 cammer engine.
Bill White
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HAVE A NICE DAY!!!!