Hello. Need to pick your brains about best intake manifold on 406 sbc with extremely ported fuelie heads. Currently reinstalling this 406 into a 65 c10 2wd after harmonic balancer walked off crankshaft a high RPM's. Made a mess but crank was not damaged so back in it goes. When I put this motor together I changed 76 cc heads for 461 fuelies with 202 valves to up the compression. These heads were ported to a knife edge between intake runners and set up for roller rockers. Currently running 480 lift cam and 1.6 rockers. Selected a c4b edelbrock from intake collection as it had biggest runners and front oil fill tube for period look. Give me your ideas on highest flowing dual plane intake manifolds. I have Air Gaps, 7101 rpms and holley 300-36 z28 clones that I am considering. Seat of pants performance and torque was unreal with antiquated c4b. Thank you.