FWIW, exhaust smell is caused by hydrocarbons in the exhaust (unburned fuel). It's caused by misfire for whatever reason: radical cam with lots of overlap, ignition timing advanced too far, single cylinder miss due to ignition problem, compression problem or vacuum leak (one cylinder doesn't usually make it smell that bad). A rich mixture can do it, but it has to be so rich that the engine starts producing lots of unburned hydrocarbons -- REALLY rich.
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Lee Peterson
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"I didn't expect a kind of Spanish Inquisition...!"
'69 Cameo White RA III Judge, 4 speed, owned since 1977 -- my first car.
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