I have to say for the record I have a '68 Firebird 350 without AC and the PHS docs to back it up that match everything.
It has #6 & #8 - 99% sure original items based on the clips, rust and paint (car had never been restored and sat for about 30yrs).

1. Rubber Pontiac logo arrow emblem and two holes in the bumper.
2. Chromed "hockey sticks" on the plastic grills.
3. 400 hood with scoops and 400 emblem.
4. Upper steel baffles aka X-panels (w/400 or AC)
5. oops I missed a number.
6. Lower steel baffle aka air dam (w/400 or AC)
7. 400 emblem on the trunk lid and holes in the lid.
8. Rubber fillers aka masticated fillers on the radiator support (w/400 or AC)