That was basically my point too (sorry if it wasn't clear). It looked to me like the AFRs were not the same in any of the pairings posted.
Probably better to initially test on a carb dyno setup.* Testing on a single cylinder engine would be best to do with a carb that's more suited for single cylinders. Just offering ideas here. IIRC Obert or Taylor reference carburetion tests using single cylinder engines. Who knows, those facilities may still be around.
