Question on 4-speed shifter hump in '64 Barracuda

I used sheet-metal screws! Five along the trans tunnel, and two on the floor. Foam insulation around the perimeter. I trimmed the lip around the gas pedal area, and at the back edge where it meets the floor (right in front of the seat support, as as was shown to me by 4spdcuda66 - thanks for that!