Cold Blooded

[AK72K10]

My 72 is my daily driver, it runs like a top (Normally), the rig has been gapped, timed & tuned (New plugs/wires/cap/condenser/coil/points/ect.) with a recent oil change (10W30), my MPG is right around 13 (Average) and the rig is garage kept. Recently we have experienced a 2 week span where the temperature has been anywhere from -5 to -30 degrees F, my truck starts fine & runs well initially, the heater functions as well as can be expected, warms the cab (New water pump/heater core/hoses/clamps/thermostat), and the radiator has been flushed with new fluid mixture added. My commute is approx 27 miles, after about 20 miles I have a stop light, and once I get there my truck idles down it will die. It never does that when the temperature is above zero and when I adjust the manual choke it only prolongs the inevitable sputtering death. It is 10x as bad after sitting in the parking lot at my work for 8 hours. I need some guidance here guys (Leaving the state and heading to a warmer climate is not an option, this is my only transpo and I cannot rideshare), any suggestions?
AK
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1972 K10 Custom Deluxe 350/350
2008 Suburban LTZ White Diamond
1972 F100 302

"Why Build It If You Can't Drive It?"