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I'd suggest keeping the victor manifold. The smaller cam is going to give you more vacuum, the dual plane is going to give you even more. Be prepared for some carb tuning, and if it runs good now I would hate to risk changing that and maybe not recapturing that condition.
Additionally, see if I read this right, you're going to change out the springs and cam, why not go to a hydraulic setup, and the money you were going to spend on the manifold put toward the lifters.
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