Carb Parts Warehouse is very good. When we did our first sled many years ago I bought bowl gaskets. The rep at CPW said we didn't need them, but I insisted that I wanted them anyway. Many years later they are still sitting in my gasket box.
A thorough cleaning, fresh jets, and that little "o" ring on the end of the needle jet and you should be in business. Only rarely do we need to replace the fuel valve (needle and seat).