I think pntrbi is right. Mine does this to some degree and I think I'm over choked and plug fouled at first and then the plugs are cleared giving a correct air/fuel which delivers full power.
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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