It sounds like a carb problem but you said you tried another carb. Have you set the idle speed up like Cletis says. Try turning the idle jet richer. Put your hand or a rag over part of the carb neck & see if the speed picks up. If so you hbave a vacuum leak or plugged idle passages.
What part of Ks. are you in?

They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
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