The decals are all on a replica/tribute to an actual 550 that was run in the Carrera Panamericana back in the 50s.
The original car was one of the first 550s and had a pushrod motor and taller rear fenders by the taillights, with 2 stacked lights on each side. It would need fiberglass surgery to really complete the look. And a carpet delete. And an emergency brake swap. And probably some aluminum interior panels.