Maybe somebody used a type of grease on the cam lobe or they sprayed some lube up there and it dried up. It’s hard telling what Bubba might do to a motor in all those years. The only thing under there with lube, is oil on the piece of felt that lubes the breaker point cam. I guess somebody could have gotten carried away. The other possibility could be the upper crank seal under the plate could be leaking a little over time.