Looks good. I can see it would be a good deal if you were in a particular racing class in which these type of engines are mandatory. But at, say, $80 for the engine, $295 for this pack. That's $475.
Google says that is around $770 AUD. Now $770 AUD can get you, if you're willing to go to a couple of auctions, a nice 500cc bike engine making over 40hp and with 5/6 speed transmission, all with low km's.
Please don't take offence, I'm just interested in peoples motives for doing up these engines rather than spending the money on a better engine w. gearbox in the first place.
*EDIT* and you also get brakes, lights, speedo, tacho, sprockets, chain, and the manual clutch with the bike rather than having to buy them individually