Core support replace or rebuild?

The previous owner decided it was a good idea to try and pull my car by hooking to the lower valance and he tore the core support in the process. I have put about three hours into trying to get it straight enough to get it in position to tack it on and work it back into place, but it is messed up bad and seems to be missing a piece that wraps around the frame. Would it be best to get a core from another car or should I build my own. I would like to build my own as it would just be the section from frame to frame if it is possible. Which way would be best? I know I could build one stronger than the original and not weigh much more, but I would like to see some pics if anyone has done it to get some ideas. By the way I am going to put a 440 in it if that makes a differance. Thanks.