I think 1960 - 1963 was too early, as he was young & hadn't filled out yet.
I think by 1966, he had filled out & he was in his absolute prime.
Arguably, his 'prime' years were the 3 years he spent in exile, but that's only speculation on my part.
The Ali that beat Cleveland Williams & Zora Foley was the best Ali we ever saw & arguably the finest HW ever.
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