When will LS7 heads be available?
Big-DEN- Accel used to make an intake like you're describing for the SBC called the Super Ram or something (was used with a TPI-style base):

Inside that plenum/box is a runner/air horn for each cylinder. I don't really know how well they worked, but they had some LONG runners (probably every bit of 13-15 inches)... the heads of the day didn't really flow that well, so something making big torque below 5500 or so RPM was the way to go.
That's where knowing people who can fab and own a fab shop come in handy. I don't diagree with your statement, you just have to have access to the tools and or someone with the tools and the skills.




