The Director's name was Sergio Leone, the name of the movie was "The Good, The Bad, and The Ugly."
Clint Eastwood was a bounty hunter called Blondie, a.k.a. The Good. Lee Van Cleef (very under-rated western actor) was bounty hunter called Angel Eyes, a.k.a. The Bad. And Eli Wallach was bounty hunter called Tuco, a.k.a. The Ugly.
The reason Stanley remarked that Arch Stanton might know is because that was the name on the grave marker next to the unknown grave where the story has its climax.
Clint Eastwood had a line about 2 kinds of people, those with loaded guns, and those who dig. He told Tuco to dig.