I'm using AVISynth via Gordian Knot.

I am trying to upconvert the deleted scene on my NTSC version of the T3 bonus disk from 4:3 FF to 16:9 anamorphic for viewing in widescreen. Unfortunately, they did not center the scene along the vertical axis.

Traditionally I would:
IVTC, using Telecide(order=1,guide=1).Decimate()
then crop(0,60,720,360)
then do a LanczosResize(720,480) to upsize to the correct aspect ratio.

With the vertical axis screwed up: The following did a fairly good job of centering the visible image:
crop(0,30,720,360)

However, I'm also trying to match the dimensions of the viewable area from the main movie while keeping the scene in proportion. This will undoubtedly mean some cropping of the image.

There are about 10 pixels of matting on both the right and left of the deleted scene. Plus, when I look at the main movie and deleted scene side by side, the deleted scene has more viewable image along the horizontal axis (top and bottom) in spite of the visible matting on the left and right (i.e. it's not just a smaller image at the same proportions).

So, all that said, I don't fully understand how the numbers on the crop and add borders functions work in AVS. On the deleted scene, how might I blow up the image to remove the mattes on the left and right, add mattes to the top and bottom, and preserve the proportions of the remaining image so they don't appear warped?