All the 216's that I'm aware of had Babbit-lined connecting rods. There is a conversion bearing available that involves boring the Babbit rod out to fit the bearing, but some sizes of them are getting very scarce and expensive. A possible work-around is a rod bearing for a 3-cylinder Perkins Diesel engine. The rod is bored to fit the bearing, and the crankshaft is ground to fit its inside diameter. One advantage to that procedure is that a "worn out" .030" undersize 216 crankshaft can be reground another .030" to fit the standard size Perkins bearing. The crankshaft doesn't really care what size it is, as long as the oil clearance for the bearing is right. NASCAR engines run 8K+ RPM with a rod journal size of only 1.850"!
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!