Donn - I agree on the headlamp bar similarity. And certainly the difference in the bumper bars design.
But on Peter's car, look at how the headlamp case tops are lower than the top of the radiator case.
On the Plymouths, the headlamp case top is higher, in relation to the top of the radiator case.
Maybe Peter can post a higher resolution scan of the original photos, so we can make out that radiator case badge.
Tom