A34 is the Super Track Pack which was the 4.10 Dana rear option that had a bunch of other mandatory options included in the price - like power disc brakes, clutch fan package and 26" radiator. The "26" on the fender tag is a normal occurrence.
Are you sure it's not M31? the normal molding package for a Cuda. Sometimes the letters are hard to read. Post a photo of the tag if you got one.
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