I'm actually close to completing a project that I've posted about on the Sergio Leone Web Board. Here's an excerpt of my post:

...I converted the Mondo BD and MGM BD into Apple ProRes HQ using Pavtube Blu-Ray Ripper at the highest quality setting. This conversion to a high quality editing codec allows me to make frame-specific edits. I also converted the MGM 1998 DVD into Apple ProRes HQ at the same settings as the BD files (overkill). I synced the frames of the Mondo BD to the 1998 DVD in Final Cut Pro 7, using the MGM BD to add any frames that were necessary, for example:

- English opening credits
- English character titles instead of Italian titles (at the beginning and end of the film)
- International cut of Tuco torture scene
- Blondie saying, "Sorry, Tuco"
- Tuco screaming, "...dirty son a biii-AYAYAAAA!!!
- "THE END" instead of "FINE"