Jimmy Nix, who previously ran a Top Gas dragster; Jim Johnson, who ran a Dodge Polara stocker, and who had won the B/SA title in 1963; Jim Nelson; and Dode Martin pioneered TF/FC. (Nix tried to persuade Chrisman to get Mercury Racing Director Fran Hernandez to allow him to run his Comet's 427 on nitro, as a way to gain leverage on NHRA, so Nix could use nitro himself). These cars ran in NHRA's S/FX class, variously defined as "Super Factory Experimental" or "Supercharged Factory Experimental".