Basing any comparisons off advertised duration can be misleading. There isn't really a standard, so some cam companies can define it differently. This information should be stated somewhere in the camshafts information.

Most when camparing camshaft profiles will look at the duration @0.200" and 0.050", along with the lobe lift. Generally speaking, the faster you can get the intake valve open, the more power you'll make, provided you can control its motion.

As for lobe separation, I would imagine it would need to be on the tighter side, but I'll leave that for someone whom is more knowledgable on your style of engine.