help needed with 904

The car came to us with a 318 and I put that corny stuff on it. It was my own twisted mopar nod to the police interceptor 318 that was believed to be in it. (I believe it to be so) but it's originally a /6...

Really like the pic of the duster.

The 318 sticker on the back though... trying to snag some unsuspecting victims? LOL