With the knowledge that Foreman had power and size I think Joe shuffles and jabs and side wines like he did vs Louis but with dart in the land a powerful pinpoint punch should an opening appear. He would have to stick to that pattern and let George blow off some steam but Big G would get frustrated and possibly leave himself open for a counter and get dropped, I am thinking JJW would admire his handy work and shuffle and slide and shift his way to a UD
You mean against the Foreman of THAt fight, not his prime? If so, maybe a decison. If prime, Foreman gets the KO.
Walcott would handle Foreman, especially since Foreman when young could not go 5 rounds or more without exhaustion setting in.