Who has the highest revving small block? Not me...I would rather make my power down lower in the RPM range...engine lasts longer, less expensive valve-train, etc. Why rev it to the moon if you don't have to? I shift between 6200-6500 depending on what ET I want.
Those R5P7 combos run 9000+ RPM, if high RPMs are your thing, that's what I would look into.