Hi Andrea,
If you do go forward with your Raiders Project. I can give you the PCM track from this disc:
http://www.lddb.com/laserdisc/11024/LV-1376-WS/Indiana-Jones:-Raiders-of-the-Lost-Ark-(1981)
which you probably already have but I also have the analog Dolby Surround for this disc:
http://www.lddb.com/laserdisc/11029/LV-1376/Indiana-Jones:-Raiders-of-the-Lost-Ark-(1981)
which has different dynamics/surround mix. Let me know if you want it and good luck on the project if you decide to go forward.