What's the deal with 455 Regals from 1973? Are they all the same? What's the specs? I know this Regal has a 455 with a "U" code. Did they all have posi? What's the rear-end gear? My brother bought this and I might be getting it from him after we redo the body and paint. Thanks, MARK Here's the link: http://www.atzauto.com/buick
