Mike, not sure about the re-build kit source, but having had several of the original carbs rebuilt, the biggest challenge is keeping them from weeping between the two halves. They warp over time. Even double gasketing didn't help. The mating surface may need machining, which I chose not to do. As much as I wanted to stay original, I switched to a Holley. The difference was amazing. I would never go back to original again.
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