Would you also maybe describe the problem as a "stumble?" The was a similar problem on an El Camino at Best of Show with a supercharged 402 from Turnkey, but it has since been resolved after a trip to Westech. Actually, the last three or so cars to go through BOS, including my own, all had a similar issue where the car had low rpm tuning issues. If you can find someone to work with the system it is probably a simple fix.
You could also tear out the computer if there is no one near you that can tune it...
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