A 1962 235 engine in a 1951 truck will have the fan sitting too low on the radiator, not too high. Dave's adapter plate allows the 216 and early 235 water pump to be used on the later model engines (1955-62) and position the fan correctly. The mid-year change of body styles in the 1955 trucks, and a similar shape change in the 55-up passenger car front end sheet metal required a relocation of the water 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!