Minato's gift to Naruto will be love. Love is the best gift one can give. If Naruto expects anything more, he's a selfish brat.
Also Minato's gift could possibly be the Sharingan.
Even if, Naruto and "his" Kurama will just pwn his ass and forcefully take away his chakra. Although Im sure it wont be even needed. We all know how "convicing" Narutos words can be.