For those too young: Potvin made a front drive located at crankshaft height and driven off a nose extension at 1:1 ratio. This was used in big sports and racing cars (although not Potvin) including Bentley. For a V8 the blower case is rotated 90°, with the inlet facing left (with the injection or multiple 97s) and the discharge facing right feeding 2 long aluminum tubes ending at the V8 engine's manifold.
The idea was the reduce the aero signature (no giant mailbox on top), but as Armond said the blower delivery is limited to blower displacement (rather than a ratio change).
There are opposing views on exactly how much air is transferred by a GMC roots, the official version is that "6-71" means 6 cylinders × 71 inches = 426" per revolution.
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