Lets think about this logically. Naruto's most basic attack, the rasengan. Its blue. So is spirit energy. So in a cross over the rasengan is just spinning spirit energy. Korra bends that shit in her sleep. Next, the Rasenshuriken. Thats just like a mini hurricane which Korra would just redirect back at him. And finally the bijuu bomb. Thats just an attack that contains positive and negative chakra. Well freaking general Zhao was able to kill the positive charka fish so I'm sure korra would be fine.
Naruto can only use 2 elements at most, Wind and Water.
Korra, as the avatar, can bend those elements. If you say she can't well, she has 2 other elements that she can use. Naruto's wind release is weak to Fire, and his water release is weak to Earth. Korra can use those elements.
In other words she can bend the only 2 elements he uses or over power it w/ it's counter.
Speed feats never matter, also half of Naruto's feats don't exist.
Some people might argue that in jesus mode naruto might be Korra. But lets think about this. The black balls of jesus juice are just all 5 elements combined. In order to make the fight work we have to set elements equal so throw away lighting (shits not even an element wtf) SO korra can bend that too. Whats naruto gonna do now? Punch her? Bitch please she's the avatar. Korra surrounds herself in a ball of fire. Sucks the air out of Naruto lungs. Rips all the water out of his body. Then eats some rock cereal to celebrate