Bad lifter?
If it was a bad lifter and you just switched it then it would have just transferred the problem to another valve. Did the play in the valve train stay at the same original valve that was causing the problem after ytou switched the components?
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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