All to common problem actually. There was a recent discussion on this very subject by the Gasholes. Brass gear may or may not solve it. MSD dist is subject to the same potential failure.
The basic problem is the clearance of the bottom bushing. Ask MSD how to measure to correct length to determine the clearance. IF it is not within specs (often the case on ANY dist) there are steps to take to correct it.
Another possible failure scenario is high volume high pressure "race"
oil pump. OR using heavy weight
oil on a cold day. High pressure pumps are used on "race" engines because the internal clearance on all parts are "loose" compared to street engines. With the greater clearance you need higher pressure higher volume to keep adequate
oil flow. On a street engine with tigthter clearance the pressure can go TO high and strain the dist gear and drive unit when using a high pressure pump.
ANY dist is subject to this problem. ALL must be measured and checked for specs on clearance.
Ernie