IMHO, the car is blowing black smoke...there is too much gas. May I suggest:
1. make sure the choke is not too closed that no air is getting past it. After sitting for two or three months, it make stick.
2. Did it backfire when you were starting it? If yes, is it possible you blew the Power Valve check ball into the frame so hard that it has not let go? In other words, the power valve may be stuck open ( no vacuum ).
3. If the float levels were off or bad the gas dumps at the bowl vents. Is there gas there?
4. Once the excess gas is fixed, the plugs will be fouled. May I suggest you remove them and clean them/replace them.
Just my opinion.
