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...and pay close attention to "traditional" RB intake. There were M1 intakes made to fit the RB/stage VI combo that did away with the spacers.


In the Stage VI intakes, the 4500 version was a much better performer out of the box. The 4150 intake sucks, unless you pay somebody who knows intakes to perform a major rework on the underside of the carb mounting pad (like I did). The 4150 version is a good example of how band-aiding a 4500 design to fit a 4150 carb can really screw up things.

Even then, the large size of those intakes' plenums was much better suited to 500-ish engines, rather than the 440-ish size to which the standard Stage VI heads seemed best suited.