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The SAR of 40:33 is based upon a 704x480 video. With NTSC analog conversion to digital, 8 pixels are removed from each side of the 720 video to get you the 704 video. But, if the 16 total pixels are not removed, you end up with the situation you found yourself in. You could have added an AVISynth plugin command to crop 8 pixels off each side and you should have come up with the correct result [crop(8,0,-8,0)].
The reason for doing the cropping is that in correctly digitized video, there are about 8 pixels of vertical black on each side of the video. By removing it, you get video out to each side, without any annoying vertical black bars.
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