Cam lobes only have to face directly away from the lifters ,(so the pointy end is in a straight line with the lifter body & pointing away from the engine) ,this saves a lot of struggling trying to turn the engine over to the exact marks...On mine I just loosen the spark plugs & turn the engine "very slowly" that way the compression leaks out & nothing can fall in (like dirt).Then look for the ones that line up ,& turn till you get them all done.