With the Brattle Theater about to begin a limited engagement of Sergio Leone's restored epic Once Upon a Time in the West on Friday, and the Harvard Film Archive set to hold a retrospective on that other great Western re-imaginist (soon-to-be a Bostonist sister site!), Sam Peckinpah, it seemed only right to hold our own miniature Leone retrospective by taking a look back at the movie that started his short but highly influential career....