The straight oil pan rail on the passenger's side uses a gasket that fits 216 engines, 1941-53 235 spray oilers, and early full pressure 235's from 1954 to mid-year 1955. The late 55 to 62 235 and 261 engines had a dogleg in the pan rail to clear a Melling M-45 oil pump or the GM equivalent. That pump has bigger gears and moves a higher volume than the earlier pump.
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!