P code Big Block Duster ????

What's the engine code on the fender tag? It will be on the bottom line of the fender tag and will be three digits with the first being a capital E (E**).

A 'P' for the engine code in 73/74 is definitely for a 400 but that was never offered in a Duster or any A-body.Chrysler is known for making some oddball and special order cars but I can't see them building a special order big block Duster,especially in the smog years when every engine/body style had to be emission certified.
If the code is a "P" my best guess is that it's a factory misprint and the engine code on the fender tag will indicate the correct engine for the car.
Is there an engine in the car now or an emissions sticker under the hood?

I looked up a P code for the series on the Valiant line (second digit on the VIN) and a "VP" comes up as a Valiant Brougham which were'nt built in a Duster body.