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To be honest if it were me I would leave the intake and exhaust manifolds off the table and spend the effort somewhere more meaningful,like the cylinder heads. You have to understand that when you monkey with the divider wall you are messing with the bottom end and with a stock stroke 383 with 3.23 gears that would be the last thing I would look at. A big engine with alot of stroke can hack it and you need to kill the bottom end.

You are about to go down a path that is labor intensive and filthy dirty all for something you butt may or may not notice. I would look elsewhere

well said, good advice.