On my roadster I simply ran a boost referenced fuel pressure regulator and an auxiliary high pressure electric fuel pump and that kept the fuel pressure above the manifold pressure. It was a dead simple system that saw no more than 8 PSI though.
All said and done the simplicity of a centrifugal supercharger makes them incredibly appealing, especially since you can run them carbureted without any engine management systems. I mean if you just want to add 40-50% HP for extra fun driving experience it's pretty easy to do.
