All types of supercharger vary the speed of the blower and consequently the boost in relation to the speed of the motor. You talkin' variable speed fans?
That said, run your engine up to 3500 rpm or so and put your hand over the carb/ air filter inlet. The motor's ingesting a huge amount of air at that speed, far more than a couple of fan motors would put out. Small fans would only be a restriction. You'd need some honkin' big fans to make any sort of boost at that rpm. Sorry to be so negative, but I don't see it working.
