It really depends on the circumstances; if Naruto and Sasuke were all friendly and randomly decided to spar in an environment that somehow took away summoning, Kyuubi, Sage Mode, Sharingan, and Curse Mark, then I'd say Naruto would win. Without Chidori or Kirin, Sasuke only has taijutsu (Lion Combo included, since he can to that without the Sharingan) and Katon jutsus. I haven't read anything in the manga that highlights Sasuke's speed, but I could have missed something. Naruto, on the other hand, can still use Rasengan, and he can still spam clones even without the Kyuubi's chakra. He is no less skilled at battle tactics than Sasuke, even if Sasuke has more book-smarts.
Of course, in a hostile, life or death situation, Sasuke might win because Naruto doesn't want to kill him, no matter what he tells Tsunade and his friends.