Demon carb setup help needed.

I picked up a 70 Swinger with a 318 that is bored and stroked to 390. The car has a Demon 650 carb on it. Throttle response is really good, stomp the throttle and it bakes the tires off. My problem is that it seems to be running very rich, especially at idle. I checked the timing and it is about 12 degrees advanced. I set the floats to the middle of the sights on the front and back. I turned the mixture screws in and then out 1.5 turns. The car didn't start too well on that setting so I moved them out another 1/4 turn. The car runs really rich and you can just smell it when driving. Has anyone had any experience with these carbs and maybe an idea on where to start? This has an electric choke as well.

Another thing I noticed is the throttle seems to "pulse" while driving. Keeping your foot steady it seems to go up and down a bit in rpms. This is very slight. Idle is about 800 to 850.

What are your thoughts?

Thanks in advance.