The motor stamp numbers are different, one in August and the other October? One has the 427 motor listed as $1,000 plus the $3,000 alluminum ZL1 the other just the $3k.
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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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