Hi all, I would appreciate some advice on a correct 2100 2 BBL carb for a 292. The truck is a 1964 F100 4 speed. The engine casting number is B9AE is a rebuild @.30 over, had Mercury valve covers and has a mileage of just over 30K. The carb is a 2100 # C2 AF AA. The jet size is ¼” x .048 and were replaced with same size new jets and other new parts. The venturi stamp is 1.02. 
The engine has a rough idle but drives fine though seems under powered. I had flushed and cleaned the fuel system, including the carb, used a gauge to set float, new filters- fuel pump, and sea-foam in 3 tanks of gas. When I removed the old plugs to oil cylinders before starting, they were black. I installed new plugs and after a few 100 miles the plugs are black. There is a heavy smell at idle. The air filter is new hand choke is wide open. When I adjust the fuel mixture screws, I turn in and as I back them out the better (Not good) idle is achieved at ½ to ¾ of a turn. Turning out to 1-1/2 is a rougher idle.
I would like to keep the truck as stock as possible. I am not opposed to replacing the carb to save time and headaches. If I do replace, I would like to upgrade if needed, any advice on what carb and where would be greatly appreciated. Thank you in advance for any help.