Hello. I have a 1948 Chevy 3100 with a 1956 straight six. It’s was running fine then all of a sudden died. The truck will start with gas pedal pressed to the floor and idles when pedal is released. However, it will not rev when I press the gas pedal and it dies with gas poured down carb. I changed fuel line, spark plugs, rebuilt carb, changed points, changed gas and checked timing. I even tried spraying a touch of starter fluid with it idling and it dies. The pedal linkage to the carb is good. I can’t figure out why when given gas, there is no change in the revs of engine. Any help would be appreciated. Thanks.