Have been lurking, but have a question now. for which my searches have been unsuccessful. I have been working on refurbishing my father's 1974.5 260z. He is sticking with the flat top carbs for now. Car had been running very rich, but we just removed carbs and reset float/fuel level, which was was too high. However, earlier on we had changed the idle mixture and idle speed screw settings to try to improve the idle. I thought I had seen recommendations on starting point and procedure for adjusting idle mixture without a CO meter, which we do not have. Cannot find that method now. Does anyone know the starting point and adjustment procedure for idle mixture screw and idle speed screw?