Was this good thing or bad thing?

Sanguine said
A friend of mine is the nephew of Armstrongs engine rebuilders..they build engines for racers all over Canada and the USA....ive been there a few times when they are breaking in a new motor on the dyno and they break the cam in...check for leaks and give her wide open....so i dont think you have anything to worry about...

I changed out a cam on a 383 years ago and when I cranked it up I held it at 2000 rpm for about 15 min so the lifters would match with the cam. I always heard that is a good idea to do this so I guess it would be the same with a new rebuild. I don't know about the WOT however!