Without Kurama he has nothing.
even with kurama it is not unlimited i mean it might as well be but there is no such thins as unlimited
on his own id say he is on par with kisame the tailess tailed beast
-Naruto has a ton of chakra on his own, I would say equal to that 30% Kisame clone. I believe Neji said that the clone was rivaling Naruto's chakra level.
-Naruto with the 9 tails isn't unlimited. We know tailed beast have a limit due to the fact the 8 Tails said that Kisame stole a lot of it, in their fight.