Not sure what you are trying to do there, Corbett...
If you want to blow up 4:3 to HD, you will have to either pillar box (which looks reasonably ugly), or you will have to crop top and bottom. You can also manually reframe the shots before you send it for upconversion.
One way to do it is to cut in a 4:3 SD sequence with a matte and reframe your shots as you cut. Then remove the matte and upconvert the footage through an AJA Kona 3 card or a Teranex.
There are also a few other options, such as "Flexview" in the Teranex, which is non linear stretching and works by preserving the aspect ratio in the centre of the image and stretching the image out along the sides. It is a little similar to the "Panoramic" button in Quicktime Player. I personally don't like the distortion at the corners of the image.
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