im thinking about making a rig with the old fx8350 and a gtx1080 will their be any bottle necks?
Bottlenecking all depends on the game and graphical settings and any CPU can bottleneck any GPU under the right circumstances. Bottlenecking is not a absolute thing or a yes or no thing like it is made out to be. Also it is 100% meaningless to even think about provided you chose your parts right and get what you want. You should chose the CPU for the FPS you want and the GPU(s) for the graphical performance you want. If you are happy with what you get and meet your goals when why worry about something that is not effecting you?
With a 1080 and an fx 8350 most likely but as others have said it varies. If youre spending so much money on a 1080 maybe consider spending a bit more on a better cpu.