Break in is over. Keep your
oil changed with a straight 30wt.
Rings don't need the breakin like they used to. Instead of hard pulls and backing of they just recommend moderate driving for 500 miles. The critical breakin is the camshaft.
FYI With plenty of moly on the lobes and a primed
oil system you idle the car to operating temp looking for leaks and obvious noises. Bump the idle to 1800 rpm and let it run for 10-15 minutes. Even a fresh dragstrip engine will get a cam breakin before running.