As soon as naruto is named Hokage, he would become the strongest Hokage. Currently, I figure him as the top 3 strongest Ninjas in the Manga in overall power with Hash in second. Intelligence is the only thing he lacks but he has Shikamaru for that. Battle wise, he has been shown to make pretty good strategies on the fly. I'd still put Minato or Hiruzen above him startegy wise though only because we don't know much about the other Kages