71 ford highboy chugging
so im having a issue with my truck, when it get up to temuture it starts chugging real bad and it runs and idles horrible. it has a 351 in it with a 4brrl edelbrock carb. i thought maybe fuel pump. not it changed it out, then i just rebuilt the carb and it still chugging only when it gets hot but has trouble starting even when its cool. what could that be??