I looked in ACME catalog and Quadratec and they both state as the last line in the Weber description "Not legal in California." CA does have strict laws concerning emissions. I dont know what could be done to legalize a Weber if its not sold as being legal.
Ditch the carb altogether and go with fuel injection. Howell and Mopar sell some that are CA legal.
90 YJ Sahara, 4" Procomp lift, OME shocks, M.O.R.E. shackles, Howell fuel injection, Borla headers/exhaust, ARB locker, 4:56 gears, 32" BFG MT, Rhinolined interior, Olympic roof rack