Yes for sure.
GTX 760 is a pretty cool GPU and can max out almost all games out there without much trouble.
Upgrading to it from GTX 660 is like upgrading to GTX 660 Ti + GT 210. You would notice the difference in frame rates.
One more thing, if possible you can save some more money and wait till October when AMD would launch its HD 8000 / 9000 Video Cards. According to rumored specifications they would trump all the current video cards.