Well. You are cutting of 187+186=373 of the 576 horizontal pixels
If you say that half or less of the video is chopped off, then you must have black borders indeed. Else you would have chopped off as much as
373/576 = 65%
The values are way too high, I'd wager.
New try
change to fullscreen first.
then check under clip frame settings whether your original (=source) movie got black borders displayed.
Now increase the settings for the left/right top/bottom cut-off by one at a time.
If you can see a borderless picture now and encode with this clipping settings, you will get a borderless mpeg file too.
What exactly did you mean by "u cant see the whole picture" by the way:
(1) it fills the screen, but is chopped off (would be a small surprise)
(2) it does not fill the screen
if you meant (1) then you should be able to solve that problem by adjusting the clipping values.
if you meant (2) then i guess it's a play-back problem. Are you playing the MPEG file on your computer? or have you burned it and played on a standalone DVD player?
If you are playing the encoded video on your computer with tv-out you may witness the problem of macrovision. (geez, tough try describing this in English. look it up if you feel to

)
As your goal would be to create a (S)VCD to be played back on a stand-alone device (why else would you encode it first place...), I suggest you burn the (properly cut, mind you) MPEG on a CD-RW and play it back on your DVD player.
Ah. It's 3 AM over here, but i still hope this makes any sense.
Good luck,
b00n