[Jim Maxwell]

The COB/COX cars were all 289 powered. They were configured as street cars,not S/C's.
The S/C's were actually left-over competition 427's that were part of a group of 50 cars that were made to comply with FIA requirements of 100 cars. They never made it past 50 , and sold the remaining 31 comp cars as S/C's for street use.
Ned Scudder has COX 6111, a wonderful left hand drive beauty that has to be the nicest combination of Cobra features there is. Powerful, light weight 289, coil spring suspension of the 427 without all that weight and fairly useless power (for the street, anyway)