Originally posted by maxuser
Although I haven't tried to install OS X with 8.6, I am currently running OS X (4K17) with 9.1 (not because I want to, but because my G4 can only run 9.1 and higher). This might be relevent to your question because Classic under OS X does not recognize 9.1, just as I would imagine it wouldn't recognize 8.6 either. Despite the fact that OS X cannot use my 9.1 system for running Classic, OS X itself runs just fine.
So, to make a long story short, my guess is that OS X would work for you just as it does for me, i.e. without the Classic environment, but fine otherwise.
P.S. Make sure to install OS X on a separate partition from OS 8.6. I made the mistake of installing OS X on the same partition as 9.1, and I barely survived to tell the tale.