Another way is soak in Blaster for a day, If you have a hard time removing the valve body screws or cover screws, a good thing to have is an impact driver available at Harbor Freight or other tool suppliers. One or two whacks with the hammer and that stubborn fastener is loose! I even have used it to get stubborn low and high speed needles out!
I have a '95 XP mag carb, $50 shipped if ya nees it. Betting you'll get it out tho.
Bills86e