A week ago I swapped an Edlebrock 1406 for a factor 340 TQ (6139 I think) that I had just rebuilt. It was running great all weekend, then tonight the car started hard and when I did finally get it started it was running so rich it's puffing out black smoke.

I took the top of the carb off, check the float height (brass floats), took the needles out inspected them and blew out the seats. I couldn't find anything wrong with it. I put it back together and it's still running rich like before.

I'm not sure what to do next.