hmm, it might fall a little behind a tiny bit with the dual 960 setup, but it sounds like you're gonna overclock it anyways, right?
overclocked it will keep up for sure and be a pretty good system. The 212 evo is a great cooler to overclock that cpu with. You have all the right equipment to overclock it with. The process of overclocking requires a little bit of patience and more than just adjusting voltages and clock speeds. You need to stress test your CPU every time you increase the voltage and the clock speed to check if the computer is stable. This can be done with multiple programs, but the main one people use is called prime95.
http://download.cnet.com/Prime95-64-bit/3000-2053_4-75869492.html
Not all chips are created equal, so some can clock as high as 5.0ghz or higher, and some can't go nearly that high. If you're lucky you will have gotten a great chip which can overclock higher.
Luckily the fx-8350 is a chip which is designed to overclock. It can be done through your BIOS, or through a program called AMD overdrive. (I recommend doing it through BIOS) Overdrive is good if you only plan on doing a small overclock (perhaps raising it 0.3 ghz or less)
Here are some tutorials from Toms on the basics of overclocking.
http://www.tomshardware.com/reviews/phenom-overclock-athlon,2161.html
http://www.tomshardware.com/faq/id-2103175/bios-overclocking-beginners.html
I would highly advise you to read up on it, watch some video tutorials perhaps on youtube, before you dive into it, but it's a relatively easy procedure with the chip you have