FN613 is the number for 75 up to 81 for a Pontiac engine, either way I'd say you have the wrong block brackets.
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated
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