What all do i need to take to machine shop?

Murray said

Sorry, but you will not meet your 400HP goal with factory "A" body manifolds. Originally they took a 330HP 383 motor and put those manifolds on it for "A" bodies and it knocked it down to 290HP. With what those manifolds are bringing, you can buy headers. Good stock heads can work if the combination is right.

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Got it. That does not upset me at all- no issue with changing those out in my mind...

To expand on my performance goals, I previously had an '09 Challenger R/T and an '18 Scat Pack Challenger. IIRC, they were like 345 and 485 HP respectively, but a lot heavier than my Scamp. I'd like the get up and go performance to fall somewhere between those 2 cars I had.