1970-1978 covers a lot of "Ali" His 1970s best was circa 1972-74. He declined steadily from 1975 onwards. No disrespect to Chissora,whom I admire for his determination in forever bouncing back,but I can't even see him beating the incarnation of Ali who lost to Leon Spinks in their first fight - '78.
Agreed. Chisora could beat the Ali that fought Larry Holmes and Trevor Berbick but he would lose to the prime Ali without much effort. David Haye destroyed a prime Chisora for crying out loud.