Try putting some air pressure into the gauge port to clear any clogs it might have. It's not uncommon for a 216 to have very low oil pressure, but "zero" is a bit too low. Try disconnecting the gauge line and running the engine for a few seconds- - - -you should get at least a trickle if the oil pump is working. There's always the possibility of a clogged pump pickup, or a stuck relief valve at the pump. Checking both of those problems would require dropping the oil pan.

Has the distributor been removed recently? It's possible to get the oil pump drive tang on the bottom of the distributor shaft misaligned and stop the pump from turning.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!