Most engines have a specific run in plan, consult the manufacturer. I have run in a completely overhauled O320-D3G recently and did so with a 3hr test flight at a variety of power settings as per the Lycoming recommendations.
This was something like
Warm/up T/O - 15mins
75% power - 60mins
65% power - 15mins
75% power - 15mins
65% power - 15mins
75% power - 15mins
Max power - 30mins
Landing/Taxi - 15mins
The key thing is to have long flights at 65-75% power early in the life of an overhauled engine.
We were on straight 80 for the first 50 hours and complete oil and filter changes every 25 hours during that period if I recall correctly. Oil test and particulate analysis after each oil change. Important to closely monitor oil consumption so that we could check the piston rings and cyclinders are wearing in against each other. Straight 80 encourages this wear vs the normal synthetic lubricant used in day to day ops.