1959 Liston was a serious threat to any HW who ever lived. The only one I would bet would beat him is 1967 Ali. Liston, I'd bet, would defeat George at his most dangerous -the 1973 Foreman and he'd do it with comparable strength and power, but through superior skill and shorter shots.
:good The straighter shots would be the difference here. Liston was also more durable than Foreman, and technically superior in every way. Bad matchup for Big George.