[FredG]

Pretty much the same issue I had about a year ago right down to the black smoke. Ran fine till heated up. Stalling. Hard starting. Black smoke. Only happened after car ran for a while. Went right to the carb to check for leaking fuel, fuel pressure, vaporlock, float levels, leaking needle and seats etc. Turns out it was the coil. MSD ignition. Changed the coil. Problem was gone. I would have sworn it was a carb issue. Found the solution on the Holley forum.

Fred