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Discussion Starter · #1 · (Edited)
Years ago I remember seeing a square flange Holley carburetor with small primaries. Does anyone remember the list number of a Holley like this? I am looking for something around 600 CFM with vacuum secondaries for my 327. I am looking to get max fuel mileage out of a 4160 style carb.

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Discussion Starter · #3 ·
That is a spread bore.

Sorry, that is a spread bore Q-jet flange, not a square flange.

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The 670 Street Avenger would be a good choice. However if you want something of a square bore design, that has small primary's, take a look at the Demon Carbs 625 Street Demon. It works very well on stock to mildly built engines.
 
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