Hi David, I was wrong the IH #70 is 7' or 84" and does cover the 454 and 684 as rear tires are set to almost minimum width.. I had Googled IH 70 snowblower and the answer was 78" wide.
With your 484 with T/A there should be no problem with 84" snow blower except in heavy wet snow no snowblower works well.
Some people have tried various lubricants on the snowblower blower drum and chute to prevent snow from sticking.
The man that does our driveway has a 110 HP New Holland 4WD with a snowblower and it will not blow heavy wet snow either. He uses it as a blade when it is heavy and wet.
BE CAREFUL never try to clean a plugged blower with PTO running, get an old hockey stick or shovel handle.