Holman Moody made a Falcon with a shorter profile than a Porsche 356 of the day.

Holman Moody was no stranger to Ford, modifying T-Birds and Galaxies on the track. So, Ford approached H/M to build a fire-breathing monster from their new, little compact Falcon Challenger III.

To make the family car a little more slippery in the wind, they removed 3 inches horizontally from the center section of the body, and chopping the roof top another 3 inches, the small Falcon was a full 6 inches shorter than the factory Falcon. Adding the aluminum fastback to the car was the final piece to make the boxy compact slice through the air. 

 The Challenger III had a shorter profile than a Porsche 356 of the day.

https://www.vanderbiltcupraces.com/blog/article/greg_os_garage_the_holman_moody_falcon_challenger_iiis_extensive_body_modifications