Speedtech 68-74 Nova Tunnel Cover - Manual (Page 4)

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4. Next you will need to mark the Tunnel Cover for the shifter location
in relation to the cover's position on the transmission tunnel. Cut a
hole approximately 3.5” in diameter for the T-56 boot to fit through.
We recommend splitting and wrapping vacuum tubing around the
diameter of the hole to prevent gouging the shifter boot. Lay the
Tunnel Cover over the transmission. With a plastic mallet tap the
flanges down so that they mate up to the angle of the floor pan.
Reposition the shifter boot as necessary to seal off the round hole.
5. As the inside of the Tunnel Cover and the area of the floor pan
covered by the Tunnel Cover may be exposed to outside elements,
we recommend protecting these areas with a high quality paint or
other surface protector. Attach the Tunnel Cover securely to the floor.
We recommend using a high quality seam sealer on areas where the
Tunnel Cover makes contact with the floor pan, and in any area
where there may be flange gaps because of floor pan shape.