Hey people,
http://www.kennebell.net works with the twin-screw type supercharger and have a nice kit for the Miata. It's smaller and lighter than an Eaton, so it should be easier to adapt for the 240SX. I wrote them but the answer was "nothing available or in the works for your application", which is kind of strange when a usable kit is available.
I think that what they need to know is that there are people willing to buy it, so send your messages, maybe the quantity will convince them to, at least, test one. Alright, go ahead and ask them to at:
[email protected]