I'm in the process of rebuilding the carb, it's a Carter YF 833SB. The car hasn't been running for at least 3 years. I've got everything pulled off and cleaned except for what looks like a check ball on the underside of the main body (see picture). I'm assuming the check ball is something that needs to be replaced and the seat cleaned? I can't for the life of me get it out. I've tried applying cleaner, penetrating oil, heating it with a heat gun, banging the body on a block of wood, freezing it, but it won't budge. I'm also assuming if it does come out, that it comes out the bottom of the main body. I contacted Mike's Carburetors and he suspected someone put the check ball in to block off the vacuum going to the distributor advance and if so, they probably beat it in to stay. He wanted me to send him a picture which I did but I haven't heard back.
Any advice would be GREATLY appreciated.