The 235 has a higher volume pump already. The Melling M29 pump used on the 54-55 235 engines with the straight oil pan rail can also be substituted for the 216 pump to increase the oil flow by doing a little creative plumbing. The Melling M45 pump fits the 55-63 235 and 261 with the offset in the passenger's side oil pan rail that clears the bigger pump housing.
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!