Maybe I'm just dense?
Maybe I just missed it, but who inatalled the cam and valve train? Whoever did it should have checked for spring bind, valve-piston clearance, etc. That person seems responsible to me for any of the problems you have encountered.
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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