Ok, I'll humor this question a bit. Hmmm, Mr. Lee did incorporate some boxing concepts when he developed Jeet Kun Do. Most notable was the incorportation of traditional boxing footwork. Mr. Lee felt that fixed stances were not the way to go and so adopted boxing's less fixed and more "mobile" (for lack of a better term) footwork.
Powerwise, I'm thinking that Mr. Tyson, if he connected a punch, would probably send Mr. Lee into another dimension. Mr. Ali could most likely do the same. Jeet Kun Do focused on not so much the power (although Jeet Kun Do strikes are powerful) but the speed and timing of the attack. Meaning that Mr. Lee would have to connect multiple punches and / or kicks with either of these gentlemen in order to attain the same effect that one of their punches could achieve.
Of course knowing what the outcome of such an encounter like this would be is just like knowing how many licks it takes to get to the Tootsie Roll center of a Tootsie Pop, the world may never know. Have a good day!