Everything stated here pretty pretty much sums it up, however on a Fram print I saw, there was a cutoff date when the tape was deleted.
Therefore not all E-body assembly line installed shaker seals received the tape treatment.
The screw and washer at the rear of scoop where the short cable exited was also deleted during production, and the 440-6 shaker feet brackets had a deleted date which is why so many of the over the counter ones never had the brackets