Rev the living hell out of it as soon as it's warmed up, otherwise the rings won't seal properly. Ideally, as soon as you put the engine in the car, you would dyno it about 6 times, letting it cool after every two runs, and starting at about 60% throttle, moving up to 80% for the second, and 100% for the rest.
Next, do an oil purge, put in new oil, and change it again after 100 and 500 miles, then go on a regular schedule.
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