neither of them alone can do anything against 5 kages....naruto may have raw speed and power but the 5 kages together have been known to use certain deadly jutsus which will be extremely dangerous if hit the target and will be very hard to evade. Same goes for ems sasuke...he can put up a susanoo barrier around him with amaterasu but how long can he keep doing that? But if they are together, i think they have a chance of beating the 5 kages. In my opinion kages have a 70% chance of winning.
Giant Jinton turns them into dust
Naruto=YES
Sasuke=NO
Sasuke should be dust right now. Oonoki had him trapped with no escape, that is until Obito saved his life.
Together=YES!! Low-mid dif. I say mid because of Gaara's defense and Oonoki's techniques.
Frankly, I think that Naruto with smart usage of his clones would be able to take it by himself, although it would be very close. But together... yeah, they takes this. I wonder how powerful Sasuke would be after Kyuubi chakra boost.Sasuke was low on Chakra then lol. He would be able to dodge it as it takes quite long to power-up. Naruto or Sasuke alone would lose. But together they would win.