I just finished Re-reading an old Mopar magazine with the big maniflod shootout on a 440 article a couple days ago. If I remember right, the 6 pack out of the box (manifold and carbs) made 583 hp on their test motor, the 950 hp carb/Holley strip Dominator manifold combo made 585 with a few less torque numbers, the M1 made the same and a Victor made 593.

My dad runs a sixpack on his 496 and I have a hard time believing that a 1050 and Victor would be worth the money at this stage. A little faster, maybe. Simpler to work with, matter of opinion. I think 1200 bucks will go elsewhere in the car first though.