If it's a flat tappet cam (not a roller), bring the RPM's up as soon as the engine fires. Keep it between 1500-2500RPM for about 20 minutes. That way enough oil will reach it during break in. Assembly lube is a must of course, but as soon as the engine fires you can say goodbye to it. That's why you need to bring the revs up so there's ample oil reaching the cam.