You don't say so but most non drilled and tapped heads used the short waterpump. When looking for brackets or pumps this is the main question you will asked: short or long pump. The short pump set up was used on cars through 1968 and trucks through 1972. The pump is easy to identify because it has a keyway in the shaft and pulley and a self locking nut to hold the pulley on. Later ones have pressed on pulleys even though they have a canned ham shape.

Evan