I have a 76, with a 350 ,4bbl. Does anyone know about the smog equipment? Is there any things that I could disconnect to improve performance? Or vacuum lines i can plug? Im not that sure of the things i can disconnect, and be able to easily connect it later if I needed to pass smog.....
-Andre

You don't really have much to disconnect...a few vacuum lines could be tossed and the EGR valve if you want to clean it up, but nothing that will make much of a performance difference.

IMHO to leave the EGR alone. It's main goal in life is to reduce combustion temperatures by recycling up to 10% exhaust gas. When you punch it vacuum dorps and the EGR quits doing it's thing cause you need power.
Also if you disconnect it you might encounter more "pinging" at part throttle conditions because your distributor has been recurved to account for the EGR mixture dilution.

Your year might have had some spark delay or ported vacuum to delay timing reponse. It real easy to tell if your have ported vacuum casue if you disconnect and plug the vaccum line to dist advance you won't see a change in RPM. Performance is improved if you go straigth to manifold vacuum

Your best bet would be to do an engine swap. I as well reside in california and own a 77 elco. When it is time to smog just simply swap the block.