distributor shaft play

fonzy is talking up and down play, 1/8" is kinda mucho, but typical. I think u can remove a roll pin and add a shim on the lower area of the shaft, but I don't think the play is causing your problem. 67dart is talking sideways play, probably not causing pinging. when no amount of retarding cures the noise, I question that is detonating. what is your compression ratio and octane?