Just measured a stock pump for a ‘59 235, which should match yours.
They are as follows:
  • From the casing to the shaft end: 2-9/32"
  • From the pump casing to the fave of the fan hub: 1-31/32”
  • From the end of shaft to the fan hub face (where the fan sits): 1/4"

Phil
Moderator, The Engine Shop, Interiors and Project Journals

1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube
Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes
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