Thanks! I'm going to do some more research. From the info here I have a good start for a plan. I know my 6 pack intake is not the most efficient but I like nostalgic stuff and tuned right it shouldn't hurt me too much.
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.
