Some of your questions I've answered under your other post "Good kit bad kit...". But I see different things here that I might be able to help with.
No, no 80cc. (though it WOULD be sweet!) The Chinese use different math/methods to figure displacement. The way we figure displacement here, we get 66cc.
I went to that site and checked that Phantom engine, and if you schroll down you'll see it seems to be a Grubee Starfire with a few extras. At this point, please refer to my other reply to your previous post "Good kit bad kit..".