Most of the Intel CPUs have a little headroom left to gain by overclocking (if you don't mind some serious heat / power), but for the most part you can forget about overclocking with AMD processors (especially the 5000 series from the reviews I've seen).
As for motherboards, as long as it's a midrange board and up, you won't have any concerns about the power delivery. Just focus on the motherboard having the features you want (USB ports on IO back panel, BIOS flash key, quality of the onboard sound, M.2 heatsinks, etc.)