I have a DMC, the starting point with stock carb will be 270 without airbox lid, 260 with it. Start with the needle in the third position (DMC startinging suggestion is fourth but I would not mess with needle). Do not mess with the pilot which should be 32.5. This is sea level jetting. A rough rule of thumb is that you would drop one main jet size for every 1000 ft you go up in elevation.
depending on air box lid, start with what I have recommended and do a plug chop to check. I personally tend to jet slightly on the rich side as you are more likely to cause problems on the lean side.
IMO the DMC is the best sounding blaster pipe...period, and one of the best (performance wise) for stock to mildly modded engines.