Only the rear of the two holes goes through to the interior of the timing cover. I don't know which years, but some Pontiac V8's used 3/8-16 bolts instead of 5/16-18.
I strongly recommend checking the timing chain slack with your fingers while the pump is off. If it's acceptably tight, put a piece of tape or stuff a rag in the fuel pump actuator hole catch chips. You can tap 3/8-16 threads without drilling the hole any larger. Grease in the flutes of the tap will insure a clean cut and avoid chips falling inside the cover. .
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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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