I've got short pump/pulley, made my own pushed hub back on shaft found shallow pulley, trimmed off excess shaft. My buddy went with short shaft/pulley but no fan, just electric controlled via therm. unit.

OR buy an adaptor plate off ebay (Pre68Dave) and use 216 pump/pulley. It's around $40.

It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy
1953 Chevy 3/4-ton Factory Stakebed