I was running the RPM intake for several years. I went with FAST 2.0 and the northwind intake ported for my heads. What surprised me was the bottom end seemed to be much better with the single plane. I was told at the time that you could have burbles (from unequal pressures) with the dual plane and could minimize that by gutting the center runner like a Gap intake to equalize pressure
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 1967 GTO, 467 roller motor, e heads ported, tremec T56 magnum 6 speed and
9" done. EZ EFI 2.0 with FAST dual sync distributor and separate nitrous system done. Track is at 4300 ft elevation. so far a best of 11.95@116. Suspension now getting dialed in...tubular front a arms with dual adjustable coil overs HR Parts n stuff rear bar and whole car lowered 3 inches..
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