those things are junk, toss them and buy Autolite plugs in a #3 heat range.
Tell me the reach and seat of your plugs, and i'll make a recommendation.
Those junk plugs are one of the reasons that the engine is loading up. My brother had a set of those in the engine i built for him, and it would gas foul them out very quickly (mild engine too). ***** canned them and switched to an AP-25, and the engine runs clean.
If that doesnt clear up the problem, then you're just wayyyy rich at idle. I like them to be rich at idle, but not wayyyy rich.
Does your carb have 2 corner idle? If so, after putting the new plugs in, warm it up then turn the driver side idle screw in until the engine starts to surge, then back it out 3/4 of a turn.
Set the other side to the same spot, then do it again, and again reset the other side. Should be at 1-1/4 to 1-3/4 turns out depending on how mild or wild this motor really is.
BTW, very nice looking car, i've checked out your pictures and the car is very nice and clean looking.
One suggestion of mine is to change your coil mounting to the upright position.