More from Road & Track, this time February 1968:
"Carrol Shelby's Personal Cobra", the twin Paxton supercharged 427 auto:
0-60.....3.8sec
0-100...7.9sec
Standing 1/4 mile...11.9sec @ 116mph
...but the bit I like is
"Top speed? We didn't run it. The Cobra isn't an aerodynamic wonder, but 182 @ 7000rpm seems reasonable with the output and the gearing" 
Cheers,
Glen