I have not ever used a snowblower on a Ford tractor, but would be interested in hearing how well one worked out for someone.
My neighbor has a small Kubota 4WD tractor and a 3 point snow blower. It apparently has live PTO, as the blower continues to turn when my neighbor changes direction with the tractor. The snowblower is about the same width as the rear tires.
There have been times when my neighbor had to take two passes at a berm of packed snow, as the Kubota seemed to run out of power when he tried doing it all at once. I got the impression that the little Kubota is not very high horsepower. However it is impressive that it can get around as well as it does without chains. My Fords would be impossibly stuck without chaining up.
I wonder if you really have live PTO on a 841, and if you do, I would be interested in learning how it operates. The live PTO that I am familiar with was a variation of the 5 speed transmission and used a 2 stage clutch. With the single stage clutch used in the 4 speeds, it would seem like there would be no way to continue to have power to the PTO with the clutch pedal pushed in. But maybe there is a way I haven't thought of.
I would think that it would be possible to operate a snow blower with a non-live PTO, just not as handy as having live PTO. It would probably be really important to make sure the blower is pretty clear of snow before holding in the clutch pedal very long. And using an ORC would be super important or the tractor would be pushed around by the flywheel effect of the blower.
My experience has been that using a piece of equipment designed for a smaller tractor works much better for me than trying to use something that is too big for the tractor I am using. I don't know how well a 7' blower would work on an 8XX tractor. I guess it would depend on how deep and heavy the snow was.
One thing that impressed me about the Kubota my neighbor has: it can be made to move much slower than my Fords will. I think that would be extremely important with a snow blower, especially if the amount of snow is WORKING the tractor. My guess would be that non SOS Fords would be pretty fast for snowblowing. Could it work? Maybe, but I would bet that it would not be easy, with LOTS of shifting the transmission out of gear to allow the overfilled blower to catch up.
If you decide to try this, please let us know how well it works for you. Good luck!