I had the same problem. Same carb, the whole nine yards. It's an off idle lean spot. Other than that the carb works great.
I had to richen the carb up with a calibration kit. Try to richen mixture or back off timing.
You need smaller rods in the lean step.
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82 Mercury Capri 302.
Comp. Cams
Tremec 3550
3.73's
12.8@106 N/A
Kevin's Capri