Nige, both cars did run but not much. The Mickey Thompson car, which had two engines- a normally aspirated 427 Ford Cammer driving the front wheels and a supercharged Cammer driving the rears, only ever set a one way speed over 400mph before being put away. Mickey's son still has the car and says he might get it out again one day.
Craig Breedlove's car ran with rocket power at various US drag strips for a while but according to my collection of old Hot Rod magazines, never made the salt.
Good, Fast, Cheap, pick any two!