I set the timing to 0 like the factory sticker calls for and it was a mistake.
Sluggish and low powered.
Try kicking your base advance to about 20 BTCD and see how she runs.
Mine is advanced a little more than that, but I live at 5500 feet.
Also, you might consider removing the airhorn in your carb and drilling the metering jet holes to about 30 thousands.
I know you said it runs too rich, but the timing advance may help with that, and it's also possible that the jets in the carb are just too big.
Just a heads up that sparkplugs can cause almost everything you describe too.
