My engine builder has done this on some of his motors and has patented an airflow device that has actually picked up around 10hp more on the dyno. The device actually directs the air from all 4 sides straight into the carb. I'll be getting it done to mine this summer. It may push my power over the estimated 475hp mark.

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www.spalisautodetailing.com
347 Stroker/XE284H(284/296 dur, 240/246 dur @ .050), BG 650 VS Speed Demon, Ported Victor Jr intake, Jack Roush World Product (ported from 180cc to 195cc) Jr Heads(upgraded to 2.02/1.60 valves) 260cfm/190cfm @ .550 lift, 11:1 comp... 450-475HP