I was thinking - Since Leone is one of the greatest and most accurate cinema storytellers of America's west and L'Amour is one of the greatest literary storytellers of America's west, we would have had one hell of a movie if Leone decided to adapt one of L'Amours novels to the big screen
Now, let's say that after DYS Leone decided to do a standalone "film on the side" outside of his Once Upon a Time trilogy and he had a big stack of L'Amour novels to go through. Which one do you think he would've turned into a movie? I think The First Fast Draw would've been a kick ass Leone movie. Very gritty, a very "Harmonica"-type character. With some Leone-ish changes put into it, it would've been one hell of a movie.