I used to have a setup very close to yours except I used a paxton VR-4 pushing 6lbs of boost, 90mm lmaf, and 2.5" mac exhaust and I made 375rwhp and 396rwt. The engine was stock from the intake to the pan. I don't know tons about the KB's but I have seen some make more power than my setup and some less, but most average about the same as my setup. From my own experience I would have to say your numbers are a bit low (like I said I'm not a KB expert however) . Also mine is a cobra as well so we are working with the same equipment.
If I understand correctly you don't have the LMAF on your yet, right? If not this could be most of you problem. I tune with a tweecer so I am not yet totally sold on the MAFIA, atleast for use on my setup.