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Like Frank says, those stamped steel cams often get bent inwards when the carb linkage gets stiff…
Which brings me to another question…Are you sure the carb butterfly is closing completely when the cam isn’t touching the follower? You can’t really tell unless you pull the carb off and have a look through the back side of the carb to make sure the butterfly is closing/seating properly. Linkages get jammed, throttle shafts/butterflies get worn, throttle shafts get corroded, all these things can lead to a butterfly that won’t close seat properly…
I’m assuming you have the throttle linkage return spring correctly installed, and it has sufficient tension…