well even i3 8100/ryzen 1500x would be much better for gtx 1060 compared to fx6300
but ryzen 1600 or i5 8400 would be even better .
(because in a year or two when you decide to upgrade your gpu
you will be facing the same problem with i3 as you are facing today with fx6300)
maybe save some more money and wait for few more weaks .