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AFR at idle should be relatively dense. since the combustion chamber and bore size is constant, if the AFR was relatively dense at idle, the motor should make good power with the throttle plate close and only the idle circuits functioning. Sorry but that is not the way it works. From page 3 of...

I agree that vacuum advance via plugging the can into manifold vacuum can be a good thing. At low engine RPM, like at idle, the air-fuel mixture can have poor mixing due to a lack of turbulence. Certainly the AF mixture is not very dense. To get the mixture in the cylinder to burn its best it...