So I was able to make it work. But not with Mavericks. And not with these drivers. I had to use Niresh's Yosemite 10.10.1 because the GTX 970 drivers that support Maxwell can't work with anything below 10.10.0. No matter what I used: Pasifist, nothing could work. I even had a success updating from 10.9.0 to 10.9.5 but none for the graphics drivers. So I installed Yosemite, (the same cpu: AMD FX 6300) with the flags: "/amd npci=0x2000", disabled the "GraphicsEnabler" from the "Customize" right before the installation, had to disable the network card because it was causing me kernel panics, which later allowed with Multibeast for Yosemite, installed 343.01.02f01, before the installation with the flag "nv_disable=1" and after the restart with "nvda_drv=1" (which I left permanent) updated with the latest CUDA drivers and now it works like a charm with all my 4 monitors (3 of them with 1920x1080 res and one with 1440x900). Btw I had an issue: from all the struggling I was trying everything I can and I left the "GraphicsEnabler" to "Yes" so my HDMI's connected monitors were not working because of that, they were not detected, just nothing - no signs of life. It all went on it's place when I put "No" instead of "Yes" in the "org.chameleon.Boot.plist". I even customized the Chameleon boot loader with the Kext Magician, made it look pretty, changed the GraphicsMode to 1920x1080x32 from the "org.chameleon.Boot.plist", put a very nice black apple in the boot logo which I replaced with the current one in /Extras/themes/ and now it's a beauty. It worked completely by itself for dual boot with Windows. Hopefully this will help someone who struggled like me and couldn't get the final result and not being even remotely close to the right answer until started all over again. Although I will admit that this experience made me slightly aware of what's going on with Niresh's Yosemite.
http://www.nvidia.com/download/driverResults.aspx/80070/en-us: Nvidia 343.01.02f01
http://www.nvidia.com/object/macosx-cuda-7.0.29-driver.html: Nvidia CUDA 7.0.29
I working with:
Asus M5A78-M LX Plus
MSI gtx 970 4GD5T OC
AMD FX 6300
Kingston HyperX Fury 8GB (2 x 4GB) DDR3 1866 RAM