Since you know about Beeman Park, I'm assuming you've been by the park or at least know the area somewhat, correct? If not, you may want to google map Beeman Park, Studio City, CA and check out the nearby streets. Assuming you do know the general area, there are many streets within that Beeman Park Manor area where Whitsett noise is minimal; Babcock, Landale, Sarah, Milbank, etc. Even on the few streets that butt up to Whitsett, as long as your not the end house nearest to Whitsett, I wouldn't be worried about the traffic noise. Obviously, if you are very sensative to noise, you may want to consider houses West of Babcock or Beeman to avoid any Whitsett noise.
As both Dot and Mary mentioned too, if you push a few blocks North of Beeman Park, you risk hearing traffic noise from the 101 Freeway. In my experience, Whitsett & Moorpark do not generate too much traffic noise as they do minor traffic delays during rush hour periods.
Thanks and best of luck!!
~ jordan elias