opinions please, on how to break in ....

Fire it up,check timing,oil pressure,adjust idle speed,check for leaks..take it out and DRIVE it,at varying speeds come back change oil and filter..your all set,as a matter of fact my last motor i broke in going down the 1/4 mile..that stuff about letting it run for 20-30 minutes sitting there is at 2000-2500,always gets a big laugh out of the gentleman that assembles my motors..