[PHM]

I have seen this exact same thing before!!! I had a 65 mustang fastback and put a new 302 in it from Jasper racing Engines. The motor had a roller cam and i just put in the stock distributor from the original motor and didn't know i had to use a new bronze gear. It wore out the steel gear in about 20 min. Once i installed the bronze gear the cam wore into the bronze gear and left these exact kinds of chips!!!! Once it wore in it was fine until i sold the car which was about 10 years. I am thinking maybe they dyno tested your engine with the bronze gear and this is the leftovers since you said you have a steel gear. I would not pull the motor if it is running fine!! JMO