Hi I have an 87 and have had my carbs on and off several times.
If the bolt is stuck real good you could try heating it up by touching a soldering iron to the end of the bolt. The only other option you have Is using a dremel tool with a small cut off wheel and cut the end off. The carb comes off easier when you do it all from the left side. . Loosen the top airbox mouting bolts. Unbolt the carb manifold from the head. Pull the manifold with the carbs and airbox back. Loosen the manifold to carb clamps and pull the carbs out of the manifold. Now you have room to seperate the carbs from the airbox and slide it them out. Hope this helps.
BTW, you wouldn't have a decent rear fender laying around you'd want to sell would you?