mate, I think you have to use a better source than Gonzo's and vhs audio. You could lift the audio straight off TR-47's and use it (so long as you've synced it correctly). Perhapps Zion or MeBeJedi would help you out with the crawls and alien scenes. You'd also want to compare the raw capture to make sure that your PAL version isn't from an NTSC-to-PAL. Also, you could use special edition LaserDiscs:

http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=6329859741

Like use the german as the underlaying source and then any identical feame that's in the Special Edition can be used to replace the german ones. Still, it's a very good idea since NTSC sucks. By the way I wouldn't use the dual-audio tracks or make it anamorphic.