Here's what I've always done... AFTER the Cam break-in, which should be done EXACTLY per the cam manufacturers recommendation...
I drive it around a bit to make sure all is good i.e. no leaks, good pressures, smooth idle, timed right, no hiccups, etc. I take it out to the freeway or empty country road, if that works better. I drive at forty or so MPH in second gear (with a 3 sp. auto) and hammer it til I hit 70-75 leaving it in second gear and abruptly let off til I'm back down to 40 or so, repeat (5 to 10 times). Then I go home and let her cool off and recheck fluids.
Next time I drive it, I usually drive it somewhat normal, but I always vary the speed, never just driving it on the freeway at 60-65 for the first couple of hundred miles. I change the oil at 100 miles and cut up the filter to look for metal and other nastys. If all is good, I drive it somewhat normal, including getting on it from time to time, generally not exceeding 4000-4500 RPM for the first 500 miles or so. I usually change the oil 1000 miles and then drive it like I will the rest of it's life.
Has always worked for me... I've probably built more than my fair share over the last 30+ years...
As stated though, you'll get lots of different methods, it will be nice to see what others recommend.
When the only tool in your toolbox is a hammer, you tend to see every problem as a nail.