In a good kung fu movie Lee would destroy Ali and look better doing it than anyone ever.
In any other situation or reality and it isn't even a fight. Ali wouldn't even break a sweat.
Ali was Undisputed heavy weight Champion of the world when that actually meant something. He was the greatest boxer of Boxing's greatest era.
Bruce Lee made great movies.
Don’t pick a fight with an old man. If he is too old to fight, he’ll just kill you.