Its a roller camshaft motor so its no like the old days of breaking in a flat tappet camshaft. Noobz nailed it with drive it like its a new motor for a bit. Check the coolant level and top off as necessary, watch the oil level as if it goes down fast the rings are not sealing (happened to me once...bad finish hone), and I use an oil with zinc and phosphorus but with the off road X-pipe. A caution for those with catalytic converters, according to Brad Penn oil high phosphorous levels can lead to catalytic converter ‘poisoning.’ However, the effects on the catalytic converter appear to be minimal during a short break-in procedure. So if you have cats then run the break in oil for a bit then dump it and the filter and go to a conventional oil.
I usually fire the motor up and bring it up to temperature and let it idle for a bit then shut it down and let it sit for a few minutes and cool off. Then I check the fluids and change oil filters and add another quart of oil. Its over kill but what's another $15 vs the thousands you have invested in the motor? I then run it for 100 or 200 miles on that oil and then change it all and then start regular oil changes or as needed if I am hammering on it at a track.
Once I have 100 to 200 miles on it I usually just let it rip. I trust the machinist / builder that I go to and this is how he has told me to break them in and so far (6 motors) zero issues. Again, roller motors and the current technology in the piston ring packs, machining, and oils help tremendously versus yesteryear.