289 vs 318 ..... Ford vs Mopar

Mustang. Hertz Rent A car package. They used Paxton superchargers.
Nope. K code HiPo Shelby GT 350's. Shelby had a 427 supercharged Cobra. I think Bill Cosby bought one of those but sold it real soon as it was too much.
Late '50's Thunderbirds with the 312 could be ordered with a McCulough centrifugal supercharger. Later became Paxton.