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#340261 is the closest number I can find installed in a production vehicle from 55 to 75. Do you have the casting date? Would narrow down the year at least. Judging by what I see here it should be a late 73 or 74. Looks like Chevy went to the 6 digit casting numbers in 74. May be a truck intake. They are harder to track since people have not formed the truck databases as they have with car castings.
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