Power Products AH47 questions

I just bought an old AH47 for fairly cheap off ebay to put into a little Manco Streaker frame I had laying around and I was just curious about a couple things. First, what size is the output shaft? 5/8" is what I would assume but there's not a whole lot of info that I could find. Second, what kind of power does this make? I've heard anywhere from 1.5 to 5 hp and I can't seem to pin it down. Third, what's the fuel mix for one of these? 40:1 is what I would assume but I don't want to blow it up