1970 300 Hurst Convertible?

[69CoronetRT]

A few of the first cars had an "H" VIN engine code, (383HP), but all had A12 stamped into the data tag.
The data tags are a great source of general info about a car but were sublect to miss strikes and deletions. the broadcast sheet is the holy grail.

No doubt the BS is the holy grail, yet given that not all cars have one, we must go to secondary sources, such as fender tags. There we look for known single or dual SPDs on package cars, specialty VON numbers, codings, etc.

Some of the early 6bbl cars (329 SPD cars), do not have the A12 code on the tag so we are forced to look at other codings such as VON numbers, 999 axle codes, VIN range, etc. to help determine if the car was or was not a 6bbl car.

What was coded, when it was coded and even where it was coded changed throughout the production year. I'm not as well versed in the 300H cars as I am the A12's but we do know examples of the 300H cars do not carry the A12 designation on the tag. It's my opinion based on the research I have seen so far, the earlier 300H cars (say below ~200,000 VIN ) do not carry the A12 code but cars above ~200,000 VIN do.

Yet...here to learn. Research continues.

 

[69CoronetRT]

A similar issue applies to the factory-built '69 Dart GTS 440 cars. First is the misconception that these cars were sent to Hurst-Campbell for the installation of the 440, which is wrong - the '69s were assembly-line built 440 cars. Next is the A12 fender tag code, which appeared only on the last batch of 440 Darts and '69 'Cudas built, of the six Dart and three 'Cuda batches built. The 900XXX code in the special order area of the fender tag is the way to definitively ID a 440 Dart, plus the LS23M9 in the VIN.

FWIW..I agree.

Coding changed during production.

(Pretty sure you had a typo there by saying A12 instead of A13.)