I just checked and rechecked my '66 Ford Mustang shop manual for the 289 regular V-8 with hydraulic lifters. It said 3/4 turn after finger tight. There are 2 complete turns of the crank shaft necessary using the shop manual technique to adjust all the rockers.
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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