This I know from experience. The tapered blade is not as good as a flat ground blade. The taper almost always puts uneven pressure on the upper parts of the slot thus distorting the brass. A parallel ground blade using a wrench/square shank screwdriver or vise grips on the shank will allow better downward pressure application on the vise/holder secured body. A short blade length will lessen the chance of the blade distorting or twisting.
A heat gun would put more heat on the entire area but would not be as guick to overheat the brass as a point flame. I would not let the temperature to get over 500 f. The seat is most likely work hardened drawn brass and will soften if too hot and as others have mentioned will also mess with the base material if pot metal or aluminum.
A lubricant such a oil/ wax alternately applied between heat/ cooling cycles will help immensely. Heating then cooling with a half day or so wetting with lube is best including chilling in a freezer. The coefficient of expansion of the two metals is different and will eventually cause separation between the internal and external threads allowing lube to enter. The greater the temperature differential the better the results as long as the softening temp is not reached. That is the reason to use a freezer instead of more heat.
You might have to cut more slots at 90 degrees on the seat using a file or saw blade being careful to put a sheet of brass, aluminum or steel around it to protect the top of the carb. It just takes patience and if you have one, a non contact infrared thermometer.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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