I believe the '69 and later engines had five holes machined into the block for mounts. Two of the five holes still match the two-hole mounts used before '69. The need for an adaptor arises when putting an older block into '69 or newer chassis.
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BONESTOCK GOATS
'64 GTO Tripower Hardtop (Wife's Car)
'64 GTO Tripower Post Coupe (My Car)
'99 Bonneville SE Sedan
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