[83SupremeBrougham]

I need some help with some starting problems. My car Blow's really dark black smoke out of the tailpipe evertime I start the car and makes a belt like squeeling sound,I have already changed all the belts can't find the squeel,but after the car squeels it powers up and the smoke takes a min or 2 to clear out and the car runs perfectly fine after it's running.I have already put on new,plugs,wire's,distributor cap,all the belts,new altenator,new battery,brand new radiator.And now it won't start at all. It starts and then it fire's here and there and there's plenty of gas getting to the carb. Can anyone tell me if they think my problem lie's somewhere in my emissions\oxygen sensor\cadalitic converter\air pump type area?? I love this old car and I'm not ready to give up on her yet,but I just cant figure this one out.