Yes. You have a Harbor Freight Greyhound. Pretty much a Chinese Lifan clone.
The side cover and rocker cover gaskets are unique and are available at Studzracing,com Someone should add this to the sticky on this engine in the Clone section. All other GX200 and clone parts work on this engine. The gas tank mount is different from a standard Clone block.
And I forgot to mention... The 68 in the number 168 means 68mm bore.