I'm pretty sure HR did the intake shootout and included a 6 pack intake on their dyno mule 383; and while it wasn't the greatest thing since sliced bread, I recall the phrase "Mopar guys rejoice" as it performed well considering some of the past issues they've had with 6 pack intakes. But, looking purely at the numbers, you could realistically expect to achieve similar numbers with an M1 or RPM intake and a well tuned 750 carb.
Is your 6 pack already complete?
