there are as many points of view on engine break-in as there are people you can find to ask about it. some say take it easy, some say wail on it, some say drive it like you normally would. here's what a lot of old school engine builders do:
once the engine is together, full of oil, and in the car, start it and run it at 2000rpm until it warms up. after(and ONLY after) it's up to operating temp, take it to a deserted road, airport, etc, and do several 40-70 runs in 4th gear at full throttle. after that, the rings are mostly seated and you can go ahead and drive like you normally would. the rings will fully seat shortly afterward, and the car will stop consuming oil. change the oil and filter at 3000 miles, and you're set. a magnetic drain plug wouldn't hurt, either, just in case there are any shavings left from the build.
also, bear in mind that a new car has probably already been raped on its share of test drives.