4.11's, 355's
With a C-4 and 26" diameter tires, I believe you'll be reving at close to 3800 rpm at 70 mph with a 4.11. A 355 will be more like 3275 rpm at 70 mph.
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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