alright guys i have had this problem for about a month now i have a 305 tbi that runs rich it blows black smoke the 02 is good and the timing is good does any one have any other ideas why it may be running rich

watch you injectors, make sure they are firing correcly, and one isn't stuck open.

check spark, timing may be correct (double check it) fowled plugs, bad wire, cap/rotor are bad. o2's can fowl for funny reasons, and very fast. i would try a new one, none the less.