Thanks @apfel_nico, just downloaded and updated to 820M.
Still having the issue with my GTX 760. Disabling the HD4000 in BIOS just causes the computer to boot to Windows, then no video after the 'loading' screen. Same resource conflict listed in msinfo32.
Windows 8 will boot with my DVI cable connected to the GTX 760, show the loading screen, then go to a black screen. Mac OS X loads no problem with the DVI cable connected to the GPU.
Edit: I guess what I'm really looking for is a more comprehensive source of information than this forum. There's a lot of good info in here, but very little of it seems to apply to my situation.
Edit 2: From what I can tell, my Mac install will boot and output video with my GTX760 connected, but it's not actually using it for processing (relatively low Geekbench score)
Follow-up: Is there a list graphics cards that Ozmosis is built to work with? I'd be up for returning the GTX 760 in favor of something that is supported.