Great find! Good thing you found it first.
Quick tips- Crank nut on the water pump side is reverse thread. YZ Flywheel puller is a perfect fit. And Bob Piper at North Tahoe Motorsports will hook you up for all of your hard parts and any tech data you need. Good prices, fast shipping, and good guy. Here's a link to one of his ebay ads-
http://www.ebay.com/itm/TOP-END-WOSS...45baf2&vxp=mtr
Drop him a note to see if he has 200 stuff, I would think he should.
Also, the only thing different from the 200 to the 250/300 is machining of the cases, crank, and top end (including jug). The chassis are the same, if you didn't know this already.