If you look at the faster Super Stock cars, they have the same limitations of higher than desired ride height due to stock front suspension, but want a low chassis bracket to get the IC needed. They usually have tubular main framerails that are a few inches below the floorpan and that gets the bottom of the chassis brackets low enough. I'll attach a small pic of Gary Wolkwitz's SS Hemi Dart that is that way. But I have seen a couple that are like mine, hanging down with a support brace.