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Hydrocarbons are basically unburnt fuel. You've replaced most of what I would suggest, like plugs, rotor, cap, etc..
One thing to make sure is that you are letting the car warm up before you go to test it (get to normal operating temp, not the bottom of the "normal" range) Get gas from a reputable place, like shell, BP, etc. Some cheaper places will put more ethanol in the gas then what it says, in some cars this causes a problem with exhaust smelling. These will make a slight difference.
If it still fails, replace the 02 sensor, just because it heats up doesn't mean it's working right.
You're really over the target range, are you sure there isn't some emission control part left out from your swap, or are you in an area with really tough emissions?
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