Mine was bought with 23 miles on it, had it's first race with about 27 miles and at the local street races with 120 miles on it. Has 7600 miles on it now, makes over 600 hp (546 whp), does not burn a drop of oil and has awesome compression and leak down numbers. I have never (for my own reasons and experience) "broken in" a motor (aside from flat cam break in) and have had zero issues with any motor I have ever built or car I have owned due to improper "break in".
So with break in, it is pretty much what you personally feel comfortable with- with the exception of babying it too much and having the rings not seat properly.
Joe