The 80's are really 70's. However, with a 36T sprocket you may hit 40-45 mph. I can't say with full qualification how it will do up hills, since I haven't finished my build that's using the 36T. I would venture to say that it's a road gearing.

With my 44T, 200 pounds of me on the bike and no mods to the engine, I could pull up any hill around here with no pedal assist. Granted I am not in hill country and peoples definition of "hill" can be quite different.

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If it ain't broke, and you mess with it long enough, it will be.