Wobble in distributor ???

Remove the dist, press down HARD in the slot with a big screwdriver, and see if you can detect any "wiggle." "Screw" the gear up out of the cam helix by applying light pressure with the screwdriver, turn CW, I believe, for a small block. Once you get the gear out of the cam gear, again wiggle the shaft, looking for wiggle.

Inspect the drive tang and slot carefully for burs and damage.