The extended cuts disc offers up to 4... or 5 versions, depending on your choosing to include or not the grotto scene and/or the uncut torture scene. I only found a way to select these directly on disc for 4 versions. But when ripping with MakeMkv, a fifth playlist option appears that is the fullest version possible to approximate the Italian premiere cut, but with English on-screen inscriptions, that includes the desert bones scene and the full arrival of Angel Eyes. I'm not sure if it includes the intermission card as that one is in Italian in the bonus section. And that version starts with this information card:
There must be a way to access it directly on disc, but I have yet to find out how. Maybe an easter egg in the menus or something?
When reading the informations in the menus for the other 4 versions, we learn that one line was kept in Italian with English subtitle for the uncut torture scene as it was never dubbed in English since it was removed quickly for the wide release, and that a line is missing in the desert bones scene, and that I already checked and can confirm we see Tuco mouthing something and a selectable subtitle says "missing dialogue".
The 5 running times are: 2:55:25, 2:57:15, 2:58:43, 3:00:32 and 3:01:57.