He did a major interview with Jeff Beck in Guitar for the Practicing Musician magazine back then at the time of it's release that basically covered everything about the making of the album.

I don't have it available with me as it is in storage and I wouldn't know where to find it otherwise. But for the most part.....it was a time when Jon was just churning it out artistically to the point where he didn't even stop to breathe and take it all in....so even he falls short at recognizing his work that came out at the time. He pretty much just associates the album with the movie so he tends to dismiss it at this point as nothing more than a forgettable soundtrack. Somehow he wound up deciding to resurrect Billy Get Your Guns for the Destination Anywhere tour. If only he had done the same for Santa Fe, a song that in one of the unauthorized biographies is named by the author as Jon's most critically acclaimed piece of work. I wouldn't disagree.