Skatdawg,
Firstly, a big welcome to the PIBB community and congratulations on obtaining your dream. What serial # '74 do you have?
In all honesty I couldn't tell too much on the audio clip. My Dad (god rest his soul) taught me to hold a large screwdriver on the rocker cover and put your ear to the handle, you'll be able to pick out exactly which lifter it is!
Julian
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