1969 Mach I 428 CJ
Not too sure about the 1970 Mach I 428 CJ, but according to my MUSTANG MILESTONES 1994 Collectors edition, it quotes a CAR LIFE test of a 1969 Mach I 428 CJ with a 3 speed auto tranny and a 3.50 axle as 13.90/103.32 as of 3/69.
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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