4 Speed Tunnel - Is it factory?

That is correct. They had ONE floorpan stamped for the a-bodies and they cut the hole using a template to mark it, stuck the 4 speed hump on, welded it, seam seal it (also done by 2nd graders) and later they added a stainless steel guard by the gas pedal when the carpet was installed because the hump was so close to the gas pedal that the driver's right foot was wearing a hole in the carpet next to the gas pedal. For safety, they didn't want shredded carpet jamming the gas pedal.