Are you certain it is not a Ford rim. Ford never put their oval Ford stamp on rims till later years. Have you checked it on a Mopar hub
Ford dog dish ring is a totally different size. The Ford dog dishes are 10" ID. That spider design is 68-9 Mopar. Here's a photo of a 68-9 dated Mopar 14x5.5 - I've sold many of these over the years: http://www.classicchambered.com/rims/14X55.jpg