The 455HO was on the spoiler ends on those with spoiler on GTO or on front fender of non spoiler cars. It was a decal. In '71 or '72 the hood read Ram Air on ram air cars.
In '71 the 455HO was in one location on Judge, different on GTO/LeMans and GT-37/T-37 was different yet. On '72 455HO call out was as described above but don't have assembly manual to verify location.
Also the manifold is painted. It was aluminum but painted. Beginning in '71 no Pontiac had chrome under the hood and entire engine was painted one color. Bonneville etc may have had some chrome but not on engine. Maybe on lid but have never seen an original with chrome anything under the hood.
Also noted that it does not say LeMans anywhere on it. I believe there should be a LeMans emblem somewhere. If memory serves me right after 32 years ago
it should say LeMans on trunk. I would like to see serial number for the car. That is the tell tale if it is a 455HO or standard 455. For that kind of money they need to give more information. Boy, wonder what my T-37 is worth? Also if an original 455 car it will have a 12 bolt.