Matt2816 :
If it was at stock speed 3.5 ghz would it bottleneck?
Well now it seems you're asking an entirely different question. The card will not "bottleneck" the CPU because CPUs function independently from the GPU for the most part. When running modern games, The Fx 8320 will be fully utilized because the GTX 1060 can easily keep up.
Now the FX-8320 will bottleneck a 1060 to a small degree regardless of the overclock. You might want to consider a haswell Core i5 if you don't want any bottleneck at all.
I wouldn't worry too much about it though especially with a 4GHz overclock.