your machine was the model before the wild wolf. The ST machines were 6 chain where the wild wolf was a 4 chain setup. The beauty of the 6 chain machines is that the engine sits a lot lower. ( Unless you happen to have one of the hybrid frames when they were switching from the 6 chain to the 4 chain setup) a Vanguard will fit with the stock engine cover (just did this conversion on a ST-400 based machine today). The mount is simple to build too. you will need to change to a 4 stroke clutch. If you get a Briggs exhaust manifold from a Max II (you can get it from recreative) you can cut off the flex pipe portion and rotate it 180 degrees then re-weld. this will have it pointed right at the stock muffler. you will need to extend the muffler inlet to reach it. here is a shot of the mod in my Wild Wolf (note: your engine will sit a lot lower) 
Good luck with your build. Tons of experienced people around here, so someone should be able to help you with any questions
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