I wonder if it was an all plants directive done by date since I've seen old '68 pictures taken of my 02D Norwood car showing it came with 302 emblems on the fenders (later redrilled for the much more visible and popular Z/28 emblems before I ended up with the car - and which also makes a switch back much more difficult) - but it possibly displays a change invoked at both the LOS and NOR facilities simultaneously...
Have you found any evidence in your LOS quest, to make an educated guess where in the Vin sequence any Norwood cars may have been affected as well?
Sorry to hijack your post here somewhat, but I had always heard the vague 'last week of Feb or first week in March' scenarios and since my car is a forth week model in obviously a very short month, I always wondered just how close my own car might have been to the NOR changeover date as well (and if I could plead a decent case for the Z/28 versions to be at least period correct) ...
Thanks - Randy