Solving audio sync problems is not as difficult as you might think, even if you can't rely on DGIndex to report the correct delay. Mux your video and audio together with a zero delay, play the output VOB file in Media Player Classic. This player gives you the option to alter the delay during playback, so it's easily adjusted to find the correct value.
However, I've seen a couple of posts saying the 5.1 mix that was broadcast was not from a true multi-channel source, and sounded more like it was upmixed from a 2-channel source. If this is the case, I would say forget this audio, and use the original Dolby 2.0 Surround from the director's cut on either the DVD or laserdisc. (Failing that, I have the director's cut on VHS, and would be happy to sync that audio up to your video.)