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.