Not Ranked
The 1967 L-88 used Holley R3418A P/N 3886091, which was a 850 cfm, and most definately a vacuum secondary carb.
However, I don't know what carb the 68 and 69 L-88 used off hand. I very much doubt they ever used a mechanical secondary carb in those years but I don't know that for sure.
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