there were no official competitions in the 70s where fight records were kept. There were no UFC or Pride Fighting Championships, there were only private competitions between schools. Bruce was in no school so he was in no competitions.
What I know is that he would fight full contact, in the Tao of Jeet Kun Do it shows techniques to fight and survive in any way possible, eye gouges, throat punches, crotch kicks and strikes to other soft spots would be used. I don't see WHY he would create Jeet Kun Do ,which was actually created when Bruce wanted to refine his fighting technique, to just use in movies. Why refine a punch to put more power into it when he wouldn't be punching people for real in movies?
If Gracie and other UFC/Pride fighters weren't on PPV or on TV they would just be unknown kung fu dudes too.