I just checked Ebay- - - - -search "216 Chevy connecting rods" and you'll find a bunch of them listed. 216 and 235 rods interchange since the stroke difference on the 235 is compensated for by the taller engine block. There are also conversion bearings available there at a killer price- - - -just over $100.00 a set. Every size BUT .020" undersize, including STD, .001 and .002 under. I just might scavenge up a couple of sets at that price while they're still available! The 1937-47 rods can be fitted to the 48-53 engines by narrowing the big end width to fit the crankshaft journal. Chevy went to a narrower rod in 48.

Now, here's a bit of trivia- - - -a set of WAY undersize Babbit rods like .030 or .040 under can be honed to a bigger size on a Sunnen hone. If you need 20 under, for instance, a set of 30 under rods can be honed to the bigger size. I've also figured out a way to put a 250/292 oil pump in a spray oiler engine, which will flow close to twice the oil volume of the smaller pump. You could have a real oddball that way- - - - -a spray-oiler with real oil pressure!
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!