I was contacted by the owner of code-ZE 455 who questioned its true origin because of someone’s handiwork with a grinder. We seemingly determined that the ZE-code 455 was originally assembled as a WD-code 455 H.O. during the 1972 model year, and was then re-purposed for 1973 when it was leftover from the strike-shortened 1972 model year. Does that seem far fetched? You be the judge!