Welcome to the forum.
For $200, it looks like a kit off FleaBay. There are a number offered, and truthfully are all about the same. With some minor modifications out of the box, and proper instillation, I'm sure that you will get many miles out of one. There are many members that swear by them. I have my original bike built in 2009, and have not had any engine trouble with it. Haven't had to put a wrench to it since built.
Pre instillation tips.
There are two sellers on FleaBay, that I don't buy from (personal reasons), so I won't recommend them. In my opinion this is a pretty good engine.
There are some Buy it now auctions, at less then $160.00