I have a 1971 Lemans Sport and would like a couple of questions answered if possible. One, the exhaust is smells quite a bit. It seems to be normal exhaust not gas or anything but it is alot stronger than I think it should be. How do I know how to fix it? A valve job, a complete engine rebuild, would a catalytic converter fix it, etc? Also, at night when I have the headlights on I notice they flicker in sync with the idle. And lastly, when I start it may idle a little high until it warms up(what I would concider normal), it may run rough and sometimes die or it may idle extremely high which doesn’t seem normal. I had the carb rebuilt and took it in the the guy and he said the carb is working fine. Would changing plugs and/or wires help or maybe something else. Thanks in advance for the help.