The original engine would have been a spray-oiler 235. Check to see if there's a triangular-shaped sheet metal cover on the driver's side of the block near the middle down by the oil pan rail. That will identify the engine as a spray-oiler instead of the 54-up full pressure type.
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!