'86 305 running rich...

I have an '86 Monte Carlo LS with a 305. It runs very rich. There are puffs
of smoke from the exhaust and it smells pig rich.

I have put the following new components on the engine: plugs, wires, cap,
rotor, O2 sensor. I have also bought a carb kit and thoroughly cleaned out
the insides of the carb. It still runs rich.

At idle if I lean out the idle mixture screws it runs rough, though smells
less rich and less smoke. If I put the screws to where I get smoothest
idle
and highest vacuum it smokes out the exhaust and smells very rich. There
are
no vacuum leaks.

It may be a problem with the carb, I think. Perhaps I need to readjust the
lean mixture stop? I know in a Quadrajet the idle circuit runs off the
primary jets. Perhaps if the MCS is not adjusting the main jet orifice
size
properly it would result in a pig rich idle and all around rich condition.
I
would greatly appreciate any advice or thoughts on this. Thanks.

    Cory