If your combination is as stock as you indicate, I don't feel scrutinizing the crossover is necessary.
I admire your attention to detail with accelerator pump nozzle and cams, but don't know that is the root of your problem.
Have you had other 302's? IMO, their torque and consequently throttle response is not overwhelming.
You appear to be on top of the detail work. Having said that, soliciting a seasoned pro such as Eric Jackson would be in order. Eric has found more than his fair share of issues and smoking guns in a carb (and can rectify it). So many times the ignition side hold the problem and the carb gets the blame. Hence, my questioning about the ignition side.
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