Throttle shaft slop is not usually a problem unless the carburetor is a high mileage unit or someone used throttle springs with too much pressure causing the bores to become egg-shaped, typically most evident on the driver side. This is why my process includes re-bushed bores with every carb, its a simple procedure to eliminate any potential slop issues.
This is what you don't get with parts store or internet parts store rebuilds. You get the same thing if you just buy a rebuild kit and do your own. You need to see someone like Scott to get a proper job done.
