To turn it over so it all lines up right I'd probably pull the rocker arms loose so the valves will all be closed. If you try to turn the crank without the cam turning with it you risk hitting a valve into a piston. You can adjust the valve adjustments all the way loose, but the rockers will still be touching the valves on a couple of them, and leaving the valve just slightly open. I'm not sure it would be enough to clear the piston as it came around.

If you lined things up right, you could put the crank a quarter turn off (all pistons half way up/down the bore), turn the cam to line it up where it needs to be, then turn the crank the right way to match it. It takes some thought and planning though to make sure you turn everything the right way to avoid valves and pistons meeting.