RPM is a "race" intake according to Edelbrock. Race intakes generally require "fitment", and don't necessarily "bolt right in", regardless of engine family. Performer and the Torker series are "replacement" manifolds, so they're much closer in out-of-the box fit. Victor often requires specific fitting to an engine as well.
RPM is the "red-headed stepchild" for most Pontiac applications. I like them on street/strip engines under 420 CID and higher revs. The bigger engines tend to get a "rush" of torque that wreaks havoc with traction and consistency. For milder streeters, the factory Q-Jet intake is a better "balance", IMO.
FWIW
Jim
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