Which intake manifold

I'm not sure what I'm looking for, but I want to up the performance of my Slant Six. I'm not sure what is entailed but I assume it involves intakes and headers. Which of these intakes is a good choice? I have a Holley 4412 carb and the 2 barrel intake.
Thanks

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If you really want something different I have an adapter that will bolt to a four barrel manifold onto which you can mount two two barrel carbs