There are often other issues with modern kits for these carburetors to include incorrect accelerator pump and wrong size orifice in the fuel valve. This is one instance where your local parts house is not the best place to acquire something.
Greg_H - one comment about the valve you mentioned. A few years ago we bought the remaining inventory of a defunct carburetor rebuilder that had used these valves. I don't remember how many cartons of these things we acquired, but there were several thousand valves. As with any product that we have not previously used, we test thoroughly prior to use. After our tests, ALL of these were placed in our "scrap brass" barrel, and melted for recycling.
Jon.
