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Your post is a little confusing.What you need is a 4bbl manifold from a 400 with a thermoquad.An intake from a 383 will work but none of those were made with a thermoquad carb.You would need an adapter to run a thermoquad on a 383 intake.I would run a 400 intake or get a holley/carter/edelbrock to run on the 383 intake.

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you have a thermoquad , run a spreadbore intake otherwise you need an adaptor .

also not the throttle valve linage to the trans will not be a direct swap to the 4 bbl so you must also address this .