John,

What you are saying is not physically possible. i.e. you can't fit a rectangular peg into a square hole.

If you are putting the entire widescreen picture into a 4:3 screen then you're either going to have black bars at the top and bottom or your picture is going to be distorted (squished) to fit into the too-narrow screen.

Have you looked at the http://www.widescreen.org/ link I posted earlier?