I bought and used a Eddy low deck dual plane six pack intake on the 400 stroker motor I built for my old pump gas Duster to race the black guys in L.A. CA on the street for money, that motor made 612 HP at 5500 RPM on CA pump swill in 2003, it made 644 Ft. Lb. peak torque at 4500 RPM, it had a solid roller Comp Cams with 260 degrees @ .050 on the intake lobes with .420 lobe lift 266 @ .050 on the exhaust lobes, it was ground on a 108 LSA and I installed it at 106 ILC. It had a set of slightly modified stock set of 1970 440 six pack carbs for a CA car with a automatic tranny, best run was right at 10.10 at 128.+ MPH corked up with the six pack pack set up with the air cleaner on and with me in the car weighing 3450 Lbs.
That stupid motor would run faster in the car shifting it at 7000 RPM than shifting it at 5000, 5500,6000, or 6500 RPM
Theory is one thing and real world results may not be what the theory says
That was one of those motors, don't sweat the runner volume and you can have it acid ported to increase the volume
Put it together now and go race it, if it needs fixing do that later