I was curious if this will be enough to power the whole thing?
If it is would I be able to overclock the CPU and Graphics card?
That's definitely cutting it fine - 550W+ for this build, I'd say (though Nvidia recommend 600W+, it's not a necessity).
I saw a review of a similar setup except they had a titan instead of the 780ti.
Do you know of a SFF(Small Form Factor) PSU that is 550W Gold?
I wouldn't go less than 550 on a build like this, give yourself some headroom
This is clearly quite a high-end build, and because of that I recommend getting a really good PSU (modular, sleeved etc.) - I would get a 650W PSU, slightly over-kill, but it will save you the trouble of installing a new one in the future, and If you have a really good PSU, you get bragging rights ;)