Here are some ideas, but yes you will have to disassemble the carb to ensure it is clean and see if it’s been molested.
It would be best if you had the Shindy rebuild kit because it contains new jets. the gasket kit shown contains the passage plug. You may need a new starter valve.
Last pic is of two junked carbs I bought and rebuilt for the practice. You should try it. I think I bought one for $25.
Before you start. Do you have the service manual? You have to set up the carb with the pilot screw like 1.75 turns from seated. Ensure you initially take all the slack out of the throttle cable. Reply back when you have read the service manual on this task.