Factory Five Racing '33 Hot Rod Assembly Manual page 328

Cut the area marked with a jigsaw.
 The tunnel sits on top of the aluminum floors and all the way up to the front of the footboxes and t h e
1.5" square bulkhead cross member.
 Depending on the thickness of the fiberglass, you may have to sand the inside of the rear of the tunnel
to allow it to sit flat on top of the drive shaft loop/aluminum.
Cut a slot in the front, top of the tunnel to pass the wires into the engine bay to run to the rear of the car.
327
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