Doesn't a stovebolt engine have a slight tilt toward the firewall? A 216 running at hot idle has virtually no oil pressure, so I'm surprised you're seeing any oil at all to the head because the oil distributor is routing most of the oil pump output to the lower end of the engine. Raise the idle speed to about 1,000 or more and I'm pretty sure the problem will go away. Unless there's at least 15 pounds of oil pressure in the bottom of the engine, the oil distributor isn't supposed to allow more than a trickle to the rockers.
Jerry
