I run a 7 foot, 2 stage, single auger blower here in MN. It's a small fan, and rated for 45 hp or so.
I've run it with a 85 hp Ford 7700, a 45 hp Ford 960, and a 27hp NH 1720.
Hp really doesn't matter so much. Live or independent pto is needed, and a slow slow slow reverse will make anything work out fine.
When the snow is deep, I need to stop with any of the 3 tractors.
The worst is the 960, which only has one reverse gear, a tad fast.
I kinda prefer the little 1720 with 3 reverse gears, nimble and light & has the loader on front to push snow around. The 7700 is nice for the cab, of course.
Anyhow, snowblower isn't all about raw hp, it's about gear selection more I think.