With a 216, having vent slots in the valve covers, I would not bother with rigging a PCV setup. Your engine will be just fine without it as long as you change your oil every 3,000 miles and seldom drive on dirt roads, or across hay fields all day long.
Someone posted a few years ago that they closed the vents, added a PCV setup to draw air from the modified down draft tube, to the intake manifold, only to find out that white creamy deposits formed on the underside of the valve cover. This creamy deposit is caused from steam which normally wafts out of the valve cover vents, but is now collecting on the underside of the valve cover since it cannot get out any more.
A better PCV setup (if one 'must' have one) in my opinion would be to pull air through a positive crankcase valve installed in the top of valve cover, going to the intake manifold windshield wiper port. Then you will need to provide a fresh air source from the center of the air cleaner, going to the modified down draft tube.
To recap:
Crankcase fumes are sucked out of the top of the valve cover, into the intake manifold. (This solves the accumulation of white creamy deposits on the inside of the valve cover from steam due to closed vents.)
Clean air is drawn from the center of the air cleaner, down through the bottom of the block via the modified downdraft tube.
Carl
