Sounds like your car is running lots better since the dyno tune. You probably are losing .3 to 60' just from poor traction/launch. I'd bet you're capable of 13.5-13.7 with some drag radials or maybe just a better launch technique.
Rev
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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.
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