Contact Mustang Club of America. They are the definitive authorities on this as they supply most of the judges at concourse events. Not really "my cup of tea", but they would be the ones with the info and publications.
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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