The 2510 blocks - (if that is the actual casting number) was introduced late in the 67 model year & it is believed that all of those engines received the deeper seat 997 cast heads. A few of the 2510 blocks were installed in GTO's late in the model year and I believe all of the batch built 67 Ram Air Firebirds which were produced late in the year. Surprisingly it is easier (if that word really applies) to find a bird block than it is a GTO one.
I do have contact with one owner of an early production 68 RA I/Automatic GTO who has a vin stamped 2510 block in his car left over from 67 production.
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Some guys they just give up living
And start dying little by little, piece by piece,
Some guys come home from work and wash up,
And go racin' in the street.
Bruce Springsteen - Racing In The Street - 1978
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