Ditto on Mike's Carburetor Parts. You can buy a bowl gasket for $5 and the full kits aren't $110. Also, your accelerator pump linkage is on backwards. When viewing from the front you should see an "S" not a "Z".
I’ve been drilling Carter jets for years. If you’re worried about polishing after drilling, just run some string soaked in brass and silver polish back and forth through the jet. Works great.