Well at the time the Ghias were positioned as more luxury-sports oriented models, and I think they had sportier suspension settings. Features like self-levelling rear suspension and a leather-wrapped steering wheel were never seen on the base EB-ED Fairmont, and until the LSD was dropped from the Ghia (with the EF I I think, until the EF II) it too was an exclusive feature.
http://eafalcon.com/general_2.htm