Rich, IMO, everybody makes a WAY bigger deal about throttle shaft wear than what really matters. Think of it this way. The incoming air and fuel charge is going to take the path of least resistance into the engine. That's through the air cleaner and right down the carburetor throat. It's been my observation over the years that you have to have a lot of wear in the throttle shaft and bores to really affect how the engine runs and most of the time you tune it out anyway when you adjust the air mixture screws.
