Fine Tuning a 360 Magnum with a Brawler "Double Pumper"

Sounds like you need to get in to how to adjust a choke properly. Which includes the air flap adjustment and the high idle adjustment. The black sootyness is overly rich (which is the purpose of a choke) but you need to make sure it turns off at the correct time, and that’s when some heat builds in the intake sufficient enough that the fuel no longer puddles. I hate chokes, no carburetor I have has a choke left on it. But I live in California and have never needed one. With regards to modern stuff, all factory calibrations have “choke like” settings in warm up tables that do exactly the same thing as a choke. It’s not because of efficiency or compression or anything else except modern efi.