For what it's worth this is why I like breaking them in on dynos. I wouldn't even think of spending that kind of money on an engine and doing a first fire in the car.
I always break them in on a run stand because if there is any problem it's easier to fix when it's out of the car and when everything is right, oil changed, ran again with no problem then it goes to the dyno if I want to dyno it. But first run is always out of the car.
