I suspect something is wrong - certainly could be me (a safe bet on any given day), but it's on their site HERE and HEREat 330#. Is this a different spring than what you were referring?
Again, that's the spring rate, not open pressure. They cannot give you an open pressure. How can they? They don't know what lift cam you're going to run. All they can do is give an approximate open pressure, which they do at .500 lift and for the 901 it's 242.
