Black smoke usually means you are running very rich. The rotten egg smell can occur if unburnt fuel makes it to out the exhaust valves and down to the cat(s). This is very likely since you're apparently running rich. Might want to check for an obstruction in the intake air path and clean up the MAF sensor. Possibly a gummed up injector?
Also, are you sure the secondaries are tied open and not tied closed? The last time my car smoked black, the ECU was fried and I was running in limp mode.
