[Frank Messina]

If you have black smoke at idle it's not the ignition or main jets, you've got other issues to deal with first. Black smoke when you punch the throttle could be that the accelerator pump shot is too rich, but that's just one thing to look at. If the motor runs good otherwise I'd leave the jets alone for the time being and go through the other circuits first. If you have a Holley, it's pretty easy to dial it in.
Frank