I have around 50 movies from the 70s.
Some favorites:
The Sting, Charley Varrick, Fantastic Planet (Le Planète Sauvage), Silver Streak, Chinatown, Alien, Annie Hall, Manhattan, Love and Death, Taxi Driver, The French Connection 1+2, Apocalypse Now, All the President‘s Men, Day for Night (La Nuit Américaine), 1900, The Front Page, The Godfather 1+2, Star Wars, Marathon Man, Shaft, Assault on Precinct 13.
A great blog about 70s movies is https://every70smovie.blogspot.com/