The Holley 4160 is rated at 600 CFM. It should work well for a 327 with stock cam. I myself like the Holley, it's easy to set up and tune. I have run several different models over the years with good results.

You didn't state what cam you are using or any other modifications that may have been done to the engine. The Edelbrock Performer is great all around manifold for a SBC.

I currently have a Holley 4150, 670 CFM, on a built .030 over 327. The cam and head work I have pair well with 670.

~ Craig
1958 Viking 4400
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1960 Chevrolet C10
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'59 Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)

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