To kind of go along with this, when did the coil stamp go from FoMoCo to Autolite?
Lots of them out there have been restored or improved while still in original boxes
There were two different dating styles used and I've got no idea of decoding the one style. Could guess but that would not be reliable IMHO. This second date style (all numbers) may represent a second supplier and it might have changed the logo at a different point in time. At least a possibility IMHO
Believe that the date of an original coil I think would be the guiding fact to the question and to that end the earliest original take off coil (FAC-12027-A) I have pictures of was a May 1966 AUTOLITE marked example. Have others dated after than date.
So it was made and in the system well before the start of the 67 production year