The camshaft, converter, rear gear ratio carb. size and intake manifold all need to match the intended application for the motor. That being said most single plane intakes are not very responsive at or below 2500 RPM and they will make more HP and torque above 4500 than a decent dual plane intake will on the same storker motor like yours
I have dyno tested several different intake combinations on 500 to 700 HP pump gas street motors and I like and use the Eddy Performer RPM on most of the normal guys motors. If they want the fastest and baddest sounding street cars then they get the M.W. heads and bigger and better single plane intakes that match the heads, cam and so on