Here's a neat piece of historical evidence I found:
There has been all sorts of arguments over the years that only GTOs got the "455HO" air cleaner decal in 1972.
Since my original owner photo shows the unrestored engine compartment with the decal plainly visible on the air cleaner, that of course caused the doubters to say that the owner must have put it on there.
That was until this Holy Grail/Smoking Gun document was uncovered in a recently found 1972 Assembly Manual. (1972 was the impossible year for locating assembly manuals as the UAW struck the Norwood Assembly Plant and killed the 1972 model year from April to September 1972. Very little assembly line info survived the strike).
Since the assembly line instruction sheet plainly states: "Engine Designation Label: 455HO Except Trans Am", that would clearly indicate that the Formula 455HOs definitely came with the decal, since that was the only other F-Body to have that engine and use the Ram Air air cleaner assembly.