How have you set the idle mixture? Did it idle nice after you rebuilt the carb and reinstalled it? Did you replace the seal and bushes on the butterfly throttle shaft? What oil have you got in the dash pot?
My 71 B20A specs are 21 to 23 deg at 1500rpm for ignition.
My isolation plate between the carb and manifold was cracked and my spare was also cracked. It idled nicer after it was replaced.
It should idle lovely. I think they will always fluctuate a little with the Stromberg with the carb piston but nothing too much.
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One day I will get rid of all of the rust.
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