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I experienced the same sort of situation with my Superformance. I experimented with different "fixes" but the most helpful was installing a wooden spacer under the carb. I tried a phenolic 3/4" spacer and it helped, but at the urging of a friend, I switched to a 3/4" wooden spacer and that all but cured it. I don't have a supplier name, or source, for the wooden spacer-----a friend had it and gave it to me. It appears to be a laminated wood, similar to high-grade marine plywood. It is definitely not a home built product.
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