I made the 3/4" drive extension with fender washers. This then made the Vanguard 18hp engine the same length as the Kohler KT17s rebuilt engine that was in the 682.
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Next, I attached the Haban snowblower and went to install the pulley belt. Well, guess what. The engine PTO pulley was now 3/4" forward of the Haban pulley. WTF!
So, I took off my 3/4" fender washer extension, and of course the pulleys aligned perfectly. It's weird that the Vanguard 18hp fit better than the rebuilt KT17s.
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More pictures;
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I drilled a hole through the heat shield above the muffler for better throttle cable alignment, and added a rubber grommet there.
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Since there has been no snow to blow yet, where I live, I cannot say how well the new engine performs yet. I've only taken it up and down the driveway so far. Starting the engine produced blue smoke the first few times, but that appears to be settling out.
Now I have to get rid of the old rebuilt Kohler engine.