Carter AVS question

I finally rebuilt the original Carter AVS that came stock with my 383 and it runs fine, and i took off my Carter 440 AVS that had the bogging problem, and the pump jet wasn't squirting when the accelerator pump was stroked, so i removed the pump jet, and put a pin along side the needle to see if it had movement, and wiggled it then put the pump jet back on, and it squirted. My question is the carb is a Carter 4966S which is a 1971 440 stock carb, so how do i stop this from happening again. the carb kits don't come with a replacement needle, but the instructions say that there is supposed to be a needle or a ball under the pump jet. not knowing if the carb has ever been rebuilt, i'm not sure if the needle is correct or if it should be a ball. any suggestions? many thanks Gerry