This. Or if you have some way to monitor Air/Fuel ratio. You spend all this money on an engine, the last thing you want to do is damage it. Little things can throw the stock ECU out of whack completely.
as far as run-in goes... I can vouch (but am open to other ideas):
For first start up - Cheap full synthetic oil, magnetic sump plug, new oil filter.
(If with new ECU) Get run-in tune ASAP - car will see boost on the dyno, keep it on the rich side, tuner should keep it running/driving on dyno till you can feel it bed in and AFR is fairly steady/predictable.
0-500kms on street - drive gently-ish, no issues with some boost every so often.
500-1000kms - drop oil, put another fully synthetic, check sump plug for noticeable chunks, new oil filter.
Then final tune.