Allmost no shot at all
First off,we're talking about a fighter who had his license pulled a few years ago because of diminishing skills.
Second off,like it or not,Holyfield relies on his head buts,I doubt he could even get his head up there,and even if he did,like you could hurt that cranium.
Thirdly,all Valuev has to do is hit you once,and you stay hit
I have absolutely no idea why this fight is even happening