Sam "The Crazy Swede" Hubinette had a car if front of the Magnaflow semi truck, I hadn't noticed the 6pak hoodscoop on the roof before

Cool, literally. That is a factory (Dodge) designed hood scoop, available as a scoop or full fiberglass lift off hod for the 1969 440 6 pak Super Bee from a lot of restoration parts companies. That must be really good for catching air for the passenger compartment

For a bit more on Sam: http://justacarguy.blogspot.com/2008/05/meet-sam-youve-seen-his-work-already.html