Despite his colouring naruto is still half Uzumaki...his mother is still an Uzumaki so he is still half his mother's genetics and half his father's. While he colouring is like his father, his looks and personality are like his mother.
He also has a lot of chakra naturally (rasengan shuriken training) kakashi said if his wasn't suppressing the nine tails (as chakra is needed to keep the kyuubi's surprised) then naruto would have 4x kakashi's chakra..this makes sense has Uzumaki's have a lot of potent chakra.
Take a look a kushina she sealed the nine tails and said the time when this seal weakens is in the ten months the child is growing as the chakra that is normal uses to maintain the seal is diverted to the growing baby and it is proportional to the childs growth. So naruto normally has a lot of chakra which is why he can make so many shadow clones. And yes while the seal was designed so naruto's chakra can mix with the kyuubi's, naruto is still a chakra powerhouse because he has uzumaki blood within him. He is still an uzumaki!
Furthermore in the chunin exam arc, naruto was able to create numerous clones and transform them into sakura, sasuke and kabuto and keep fighting for an entire night. And still come out fighting after all that...and having spent 5 days in the forest of death...sasuke even remarks on that. This again is due to naruto being an uzumaki and having ridiculously large chakra reserves.