Theory sounds good, but when chry,gm and ford had the long intake runners the carb was mounted on the end. You had a carb then the long intake runner then the heads. It worked as the Ram Chargers proved back in the 50's and 60's.(smaller cfm carbs) The fuel charge had to have a high velocity to really work good. It's the same effect as todays tunnel ram intakes on hi performance cars. The carbs have to have low cfm ratings to work on the street. A 350 chevy with 11-1 compression, a decent cam and a set of big ole holly 850s runs like crap until about 5000rpm. then it hauls butt. Same eng with a set of 350cfm carbs can be street driven.

Do you plan on putting the 7" extension between the head and carb or just as a velocity stack on the end of the carb? Imo the biggest advantage would be between the carb and head. and a nice velocity stack to help inprove the flow into the carb. but i think the eng would be a dog until about 5000rpm then it would probably rip the wings off.
Great thread! I like thinking out of the box.