You are right but for the first 200 miles i will never exceed 4K rpm just to be safe.IMO,you need to vary the load and never maintain a set rpm;loading and unloading the engine basically heats it up briefly and then lets it cool. I wouldn't keep 4k rpm as a max,you can safely run higher rpm then that. I'll let the builders who are more knowledgeable then I am give their suggestions. You can also break the engine in on a dyno;which I have done successfully in the past as well. Lotta different theories on the proper way to break an engine in.
I also agree on varying the load.
Chris