Possibly.
A 7860K is a 65W CPU and a 750TI being 60W.... with the balance of your components (RAM, HDDs, Motherboard etc) adding a theoretical max of somewhere in the region of 90W.
That puts the total a little over 200W, theoretical max. A setup is unlikely to ever be pulling close to that (I'd expect yours, even with the GPU to top out at 175W).
If it's a quality 250W and is actually capable of 250W continuous (oposed to peak power), it should have no problem.
That being said, I'm not aware of a 'quality' 250W PSU in all honesty.
I'd suspect you *should* be fine, but the only way to know for sure is to try it