That definitely does not look like the original HH120 engine.I eventually ended up paying $175.00 for this #12. It needs a starter, a couple belts and a battery.
It has a few other small issues that I know of and I'm sure there are some I don't know about but . . . it's a long winter.
I'll have time to work on it then.
It does have the 12 horse Tecumseh in it still. Not sure if it is original or not.
I'd like to find a mower deck for it though.