Look on EFI forums for more details of how CA smog laws affect tuning and passing it, plus the engine combo. I don't know anything but what I have read, examples on the Corral are there yearly. I gather that you can pass with all kinds of modifications, the internal kind not the CARB part number crap. So any compression and cam for example, might pass, but it comes down to a proper very good tune, and the proper engine combo that isn't mismatched and won't ever run right.
So do hunt some more and contact a tuner etc, Don Lasota is recommended here by several members. If they tell you that it's possible with various combinations, raise the compression to what a custom cam source suggests(Ed Curtis is the big name I'd go to). I'd expect him to say 9.6:1 or close, to run on regular 87 fuel. Have an Explorer intake ported top and bottom, open up the exhaust as much is possible there, and use a little larger MAF and TB. If it's a 302/306, rebuilt stock injectors might do, but I'd ask that too of Ed Curtis, I'll bet he says go a step bigger. Stock shifts are at 5000rpm, with a step bigger heads and the intake, the cam can make it push 5500rpm easily. Tune the PCM for all of that, and some counties in CA don't require the OEM tune to be there, they don't check the tune for originality. Some counties do have those bad tests, that's part of the hell which is CA.