From what I can tell, you have 2 options. You could adjust the darts to make them bigger (you may want to make a muslin to fiddle with this). Patterns are usually made for a B-cup, so if you were a C-cup, the difference is about an inch, so you would have to make each dart (the bottom darts) 1/4 inch deeper. This would take in 1/2 inch per dart, and 1 inch total. Does that make sense? That way there would be an extra inch difference between your bust measurement and your waist, where the dart begins. You can probably leave the darts on the top as they are, but I would try on a muslin or baste everything together to try on just in case.
Alternatively, since the top has darts on the bottom and the top, you could just cut a line between the darts (ie the top front would be in 3 pieces) and treat it as a princess seam. There is a great tutorial for adjusting the bust on princess seams here: http://www.flickr.com/photos/38923480@N00/sets/72157594193947536/
Hope that helps, good luck!