Back in 2011 on my 1971 Buick 350 I replaced my old point style distributor with a HEI Pro Form brand part# 67088 from Summit which ran on top of my 284 TA Performance cam. Upon removal to replace the timing cover the end gear was found to have worn down to the point where the gears are now sharp. Is this a common issue? I am looking to replace the gear with a hardened one but would like to know the cause of the wear.