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Originally Posted by Oldsguy
Denis, as far as I can remember most all Holley carbs are squarbore which means that both the secondary (two back holes) and primary (two front holes) are the same diameter.
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Actually, Holley did make a spreadbore carb in 650-800 CFM that was available in both single pumper/vac secondaries and double pumper/mech secondaries versions. See attached photos.
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You should be able to find a nice performer manifold from Edelbrock that would work fine or perhaps an older model like an O4B like Joe mentioned.
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Be aware that the O4B was made in both square bore and spread bore versions. It also won't clear an HEI.