hi all need a little help

all right it a 426 stroker any ways when you go to let the car idle for a while like if you were pulling into a car show it wants to stall after it idles for a while timing set a 12 degrees full in is 31 any ways cars temp is about 180 put new carb gaskets in it its got a qf carb 850 four corner mixture screws any ideas would be great.PS its pulling 13-14 inches of vacuum.car got a 3500 stale to.
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