Re: 454+headers+A/C brackets?
No, but I would look for the best flowing manifolds you can get.
Look up castheads on YouTube. He builds nascar Saturday night special engines. From what I see he specializes in small blocks, and mostly chevy. Either way you can pick up a few ideas to increase flow.
Below 3000rpm probably not much change, but after with that cam you will feel a difference.
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