whos telling you all this stuff?
gasket are set when you bolt them down, ill say it again, the only thing is the rings need to be seated in the cylinders, it has been said, driving it hard right out of the box seats the rings best. the bearings, lower end, cam, are all set and ready to go, if they were to break in, they would also wear out. and im not talking rev limiter burn outs. some firm driving, spirited if you will.
this is where the term, its gonna "go or blow" comes from. you either built it right, or not. see what im saying.
if you hear a noise right a way, turn it off, start digging for what you messed up. if you hear nothing bad, and it sounds good, drive it.