Petty left Plymouth in protest that they did not have a winged car like the Charger Daytona. He went to Ford one year and was then came back to Plymouth when the Superbird was built(mostly just to get him back from Ford).
It would have been very interesting if this car and the cars Chrysler had planed got to fight it out but Bill France wanted nothing to do with that and banned them.
It would make a cool build, I have never seen one built.