From posts in other forums, I believe you're referring a '68 Cougar 390 Gt. I think you ought to expect maybe a 15 sec ET at maybe 90 MPH if the Cougar is stock. You won't see that 13 second ET unless the car is extensively modified.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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