There is no set run in procedure,as zvhturbo says running @2500 for 20 mins at first start is basically to run the cams in alone. Running the engine in can be done on the go as tomsxr3i said. Varied load is advisable so no constant motorway miles. Plenty of oil changes and if you can empty a small ammount into a clean contianer to check for excessive debree. Personally after first run,if there no leaks i like to run my engines in fairly hard,uphill full throttle or high gear from low rpm to high rpm every couple of mile on the motorway. Long periods of idle arent too clever,and change down before the engine labours. Basically if its built right it should be ok. Put some juice in and get cracking