B; I can't say anything definite about that setup, because so far it is only on my "Training Carb" (an HS6 mounted on a wooden pedestal and used for demonstrations)...but it seems to me to be a nice configuration (actually not optimal, see response to 142Gs comment below!), and it is functionally quite similar to the Air Filter over VStacks arrangement in my 1800, which I have never felt was wanting for breathing!
142G; I totally agree, and when I did a quick calculation of cross-sectional area comparing stack orifice to the band between end of stack and cover, I found the area to be less than orifice area...that wont do at all!! I have another configuration in the works...stay tuned!
Cheers