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People always say: Base Naruto but no such thing exists, not once in the manga did Naruto fight without Kurama giving him a nearly endless supply of chakra, even when all this chakra points are blocked he can still access this chakra. Not only that but the Naruto nuthuggers talk so much crap about Sasuke's sharingan but they never once mention Naruto's Uzumaki Body which by itself gives Naruto an even greater supply of chakra. So essentially Naruto has both an Uzumaki Body & Kurama both giving him extreme amounts of chakra, increased durability, etc.