WC,
I went to a wrecking yard & bought two pulleys from the same model car. I turned them in the lathe until I got the pieces I needed to get the correct offset and extra pulley, because my pump pulley is a dual pulley. I then welded it. This would be difficult to do without a lathe. In my GTO Restoration book by Paul Zazarine, there are a couple of pages devoted to pulley combinations [ sizes are given ] for 64 onwards. a/c, non a/c, p/s, etc had various size pulleys for pump, crank etc. You may be able to get from this list, a size combination with the correct offset, that works for you.
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