Byron,
Sal is correct. At one point Chris Craft used twin 427's, one of which was counter-rotating.
I don't know who made that particular supercharger setup in question nor which way the blower or engine are set up to spin. It has been sitting around for a long while. You get the sharp eyes award though!
The superchargers I build spin the correct direction... you've tuned and driven a few of them yourself, I am happy to say!
(and, Hi Sal!
)