Water injections are still verry popular and are now made by Edelbrock and other known companys.
Everything is computer controlled now with Big PSI pumps and special jets and all.
Lot´s of the turbo guys have them so they can advance ignition without ping.
Just type Water Injection in Google or Ebay.
I got 2 vintage sets. One is in my 41 Sedan. But more as a decoration in the moment because it was not made for a dual setup. I´m planning to modify it for the offy intake and let you know how it works.
Frank