I have the same problem with my 76 Buick Custom Wagon. Stock 350 with quad 680 cfm. It has been rebuilt and was the original from the factory and still has the same problem. Simply put, it is cold blooded. Though it has an electric choke and works perfectly the mechanics I know have all said the same thing and that is manifold heat seems to work the carb. When it is cold the engine idles in accordance to the choke but once I put the car in gear if I did not allow full warm up time than as soon as I put the pedal down the car stalls. I have just learned to feather the pedal lightly to keep it going. I grew up knowing this problem as simply "cold blooded" and always appeared to be more of a problem I had with my Chevy true small blocks.
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