With a stock sub you will need to
#1 Cut approx 8" wide by 20" long hole in the tunnel from about 3" behind the shifter. Then lift the tranny at the crossmember to the proper angle. Build a sheet metal box as needed to cover the hole and cut out the hole for the shifter.
#2 Raise the top of the tunnel by cutting the vertical sides just below the radius and once new height is determined weld in a strip of metal on each side and boxing the ends.
#3 Skip all the crap and buy a pre-made fabbed tunnel plate.
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