Hi Tim, Why not bore them out. It's not difficult. Make yourself a dummy mounting that will hold the whole carb in the lathe on the screw holes and just very gently pass a boring bar through until the bores match. You can even bore out a 389 to 1 3/16inch this way. just clean it very carefully afterward and make sure the tiny bleed hole is clear. I have done quite a few over the years this way.
Roy
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