After escaping So Cal in 1989 I haven't given it much thought. However, if they require you to come up to their original equip standards, you will need a smog pump and an egr valve. Out here, if it's 25+ years old - none of that matters. You might also need a catalytic converter, but all I have is the FSM for the 77' RC. If you think it would be the same, I will get all that info for you, but - pump, egr and converter pretty well sums it up. Have you tried a local Dealer? Some of the parts guys or even service manager might be a fan of your truck and will know right off what you have to do. If someone put fuel injection, i.e. a different engine in it, you might not be able to satisfy them. Another reason why I left...