My 68 GS350 has a 1971 Buick 350 in it, with 72 heads. The distributor should be on the front of the engine to be a Buick. My 71 block has the block # stamped vertically on the front of the block on the left(driver's) side between the power steering and the distributor. Not sure if 72 should be there or not.
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David Gramlow
1968 GS350
GSCA 861
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