does a score to exorcist III exist? iIwoulld really like hearing this errie music in full!! any help is immensesly appreciated!!!

I don't think this is right place to post this kind of requests. There is own section to requests.

only a bootleg with SFX exists for this...

.....which you can find here:
http://forums.ffshrine.org/f92/exorcist-iii-legion-1990-bootleg-15-tracks-79829/#post1537341