Naruto could blitz, but rest assured he'll be tired before Itachi is if he continuously blitz.
Itachi could just simply find the real one and Solo it. After all, he kept up with Naruto in BM when doing taijutsu... Naruto is solo'd.
Gambunta would just fall on a crow clone, that simple.
If Naruto needs all this to beat Itachi in the first place, he's TOO weak. lol.
When did Itachi ever keep up with BM Naruto or fight BM Naruto for that matter? Never.
Itachi's chakra reserve is fodder compared to Naruto's. Itachi will get tired before Naruto does if he keeps his susano'o on.
Naruto stands back letting waves of clones deal with Itachi while Itachi is wasting his chakra with Susano'o. If Itachi turns off Susano'o he'll get owned by gang Odama rasengan. If he activates it then he'll get his chakra drained quickly.
Naruto's SM clone beat Third Raikage. Naruto's clones are pretty damn capable and he's a chakra tank. He gave every shinobi in the alliance enough chakra to fight Madara. He's a chakra tank. He wont be running out of it before Itachi does.
When Itachi does run out of chakra, it's rasengan.