Well in that case I would recommend using Project Threepio, which provides fanmade subtitles for the original trilogy. It is synced to the GOUT (2006 bonus dvds) but can also be used with other preservations and projects, like Harmy's Despecialized and the Dark Jedi releases. If you want the subtitles to work with more exotic resources, like Puggo Strikes Back or the -1 grindhouse release, go to http://originaltrilogy.com/forum/topic.cfm/The-GOUT-Sync-Thread/topic/17357/page/1/ .
Even if you don't care for the voiceover, it's possible the one you have is different from the one in Harmy's releases, so preservations would still be nice.