Looks like a very early 074 based on 2/16/68 cast date. They must have used the plug castings and changed the combustion chambers? How do the combustion chambers look? Cast or have they seen the die grinder?
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1969 ZL1 COPO Camaro 11.60@120 F.A.S.T 21
1971 LS6 vette 12.20 @118 PSMCDR
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