I was looking at this machine for sale locally here in Nashua:
http://nh.craigslist.org/for/4848963358.html
I have the same machine built by Simplicity/Alias Chambers in 1976/77. The one in the add has the engine replaced with a 10hp Tecumseh Snow King. Mine has a 8 hp Briggs & Stratton with the before mentioned downdraft carb. I had to put chains on mine just because of the slope of the driveway. The tires/rims on this machine are only 6” diameter. The new machines all have bigger wheels, like you stated.
I think the best machine would be a machine like this with a HONDA 9-10 hp engine.
Kinda high for a machine that old.
I wonder if it’s a thrower or a blower. (Single stage or two stage) Can’t see if it has the blower wheel behind the augers.
I’m guessing its a thrower because its chain drive and looks exactly like the thrower on our Simplicity tractor. The auger in front spins very fast, very dangerous.
The throwers aren’t as good as the blowers.