If the motor is more on the serious side check this out......................

"Test 3: Single-Plane Intake
Dick Landy once quipped, "We'd make another 75 hp on this thing with a decent tunnel-ram." Of course, he said that while pointing to a $5,000 fabricated sheetmetal cross-ram, but the message was that ditching the dual-plane would be worth top-end power. We've always bought into that theory, so we installed a high-rise Ray Barton intake and waited for greatness.

It didn't come. To our surprise, the engine struggled to make a smooth curve with the big manifold installed and didn't make any more power except from 6,100 to 6,500 rpm. It did produce the best peak horsepower with the small cam-615 hp at 6,500 rpm-but this intake clearly requires a larger displacement or more engine speed to shine. We wish we'd tried it with the big cam, but it looked like Uncle Dick should not have been so leery of his ported M1."

http://www.hotrod.com/techarticles/engine/hrdp_1008_dick_landy_484_hemi_engine/photo_06.html