You're right at the margin with the economy 450W PSU and the GTX 1060. But the PSU has a 408W rail (+12v), so it is fairly strong for that class of PSU. As long as you don't OC the card or the CPU you should be fine. The 3.7OC you say you have now isn't enough to worry about IMO. The CPU turbos to that with 2 cores, anyway.
3.6GHz all cores
3.7GHz 2 cores