The pump is the same as a V8, that bracket that bolts to the head is unique to the 6, the head bolts have a bolt thread" on top to take those 2 nuts that hold that bracket down. This is a 62 235. No different balancer, just a second pulley.
This stuff is expensive and hard to find since not many 6's had power steering, I assume the same setup from 62 back to maybe 60 as I know 60 was the first year for that style of PS pump, 59 and older was on the back of a generator. I've seen the brackets and bolts and pulleys sell for $3-400US.
63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC. 1963- Pontiac top selling car in Canada
Mahone Bay, NS Still not old enough to need an automatic
Check Steve at Authentic Automotive in Texas, he sells good stuff and may have the 6 cylinder bits.
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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC. 1963- Pontiac top selling car in Canada
Mahone Bay, NS Still not old enough to need an automatic
If your 6 cylinder has the single groove crank pulley, apparently there is a way around it by using a ps pump with a double pulley. There are brackets sold online to achieve this setup.