There's a lot of posts suggesting jacking the camshaft around - yet nobody has mentioned that would be foolish without seeing what kind of valve clearance you have now. Just because it should have clearance with the parts listed doesn't mean it does . Since you don't really know whats inside the motor and are going on the sellers word, I'd stick with tuning carb, timing, suspension, tire pressures etc., before I would mess with a cam degree change that may break a bunch of parts.