Some car movies where sure wacky back then, they are still wacky but in the 70's it was at another level.
check out the fake motor used in the car.
and here is the real motor.
From the article:
It features an unusual combination of a Volkswagen chassis, Corvair air-cooled, dual carburetor engine with a 3-speed manual transmission. The supercharged V8 in the back is faux, while the actual motor is under the bonnet as it would be in a standard Corvette. A Corvette-style body riding on custom wheels and BF Goodrich Radial T/A tires complete this peculiar scenario.
10 pictures and full article
.