Great you got it off👍 last time a carb was stuck for me, it was because of old nitro fuel gummy residue. By heating up the block you're freeing up the residue and make it more liquid.
That bolt cannot be removed while the carb is in the engine. If you removed the nut from that carb bolt, the carb should be free to move out the engine. If that doesn't go so easy, try wiggling it a bit to free it up👍
This is that bolt, and it can't be turned or removed when the round bottom of...
Remove the carb from the engine, remove everything non-metal from the carb, spray WD40 and heat the carb up (a lot), then try to move it. Once it does, spray some more WD40 on the slider and slide it around a couple times