69 Barracuda tag info

A "P" in the vin designates a 340 car, not necessarily a Formula S.
You could get a 340 without ordering a Formula S or a 'Cuda 340.

A53 is a Formula S, and could either have a 340 or a 383.

The data book states that the 383 was only available with the Formula S or 'Cuda 383 package, yet there were 182 notchback 383 cars built in 69 that were neither a Formula S or a 'Cuda 383, (no fastbacks or convertibles built).

The Formula S cars for 69 had, among other things:
Black rear deck applique
Formula S medallion (on the rear deck applique)
Black radiator grill
Engine identification (on the front fenders, 340-S or 383-S)

You could also get the optional full length sport stripes which incorporated the engine displacement in the stripe, 340 or 383. My understanding is if you ordered the stripe the 340-S or 383-S emblem was deleted.

A56 is a 'Cuda 340.
A57 is a 'Cuda 383.
A13 is a 'Cuda 440.