location for ignition box?

I mounted mine upside down on the horizontal panel under the dash when I converted my '66 Valiant to electronic in '74. I sandwiched an aluminum plate between the box and the panel to ensure a good long-term ground. I transferred the box (and the aluminum plate) to my '65 Barracuda in '77 when I transplanted the 340 from the Valiant to that car. It was still working great when I pulled everything out 2 years ago. I like keeping electronics as cool as possible!