never heard about flat bypass covers. why not just use the air pressure nipple and just mount the pump somewhere if you are worried. You can also just drill a pulse hole on the bypasscover and mount the pump on it if is the ones with the moldings all ready for a pump. . This is the cleanest method just plug the air nipple behind the carb. I would not worry to much on the “performance” of a 60+ year old engine.
another option is drill the bypass cover and install elbow to get a pulse line. mount the pump somewhere .
I have done various options and I found the best one to be pump on a plate over the bypass cover. Jst use longer bolts and off-set the pump to fit. drill both the bypass cover and plate to allow pulses to reach the pump…. centered with the plate hole.
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