any decent garage with someone who has worked on older cars should be able to do this for you. They should check the base ignition timing, the co with a gas anyliser and the idle speed, and adjust as nesesary. Its also worthwhile pressure testing the boost system to check for leaks. There is a special extra long allen key for adjusting the co, and they will require a timing light and the correct timing figures to set it (15 deg with the pipe off iirc) nothing else to adjust on this system other than the above.