64 Dart with 273 4-speed Carb

I ran a 1401 on my 273. It ran ok however it seemed to run rich. Changed out metering rods and jets several times. Still the same issues. I went ahead and had one of my Carter 9636 carbs rebuilt. Carter performance replacement for the 340/383. Ran the same carb on my other 273 with no problems. Now, after changing out the plugs I found the motor overall is running lean. Plugs on the white side. I figure it has a little too much advance or it’s the exhaust. I’m running a 2 1/2” single pipe back to a Turbo the from there to the stock resonator.