Two ATGs. Foreman is generally ranked a bit higher in the ATGs ranking. Prime for Prime, who do you think would have won?
If Ali couldn't keep Foreman away, Lewis certainly can't. Eventually Foreman will find Lewis' chin and we know what happens next. Foreman is a master of cutting down the ring and knocking people out. Lewis would keep away for a while and avoid the KO but eventually Foreman gets there. He would box Foreman for a bit, but I doubt he engages enough to knock him down or do enough damage. One or two punches at a time. Lewis has been knocked out by lesser punchers, he has little chance with Foreman. This is a bad stylistic match up.