why do you think your going to gain performance? If you look at how the egr works its not on when your foot is flat to the floor, getting rid of the emission controls wont get you any more power or economy if you put extractors on it that gets rid of the efe system.
Block up the hoses that come from the manifold and carby the ones now sucking air weather or not it would pass a rwc with extractors is another question Ive never been game to ask the rwc bloke Ive had a couple passed weather or thats legal or not I don't know. If only I kept all the emission stuff I'd take off and thru away when I was young does yours have the air pump? Convert it to efi with a vn delco ecu I say delco because the ole vk injection is no good.