Yes it does have more then enough power to push a 72" blade as well as the traction to do it.
We just did a RTV1100 with a blizzard blade and we ran into a problem with the low ground clearence of the blade and had to add a lift kit.
It would push a full blade in two wheel drive angled! We also have a used 900 from the sale of the 1100 and we have been amazed at what it will push!