Hi ggauld, you should start a separate thread with your question as this original one is getting old now.
The QD rods started to change around ’59 with a wider beam and bushing at the small end to help prevent the wear you are seeing. The wider bushing might not fit between your pistons pin bosses without being ground down. ’61 to ’63 QD rods are totally different and must be used with the matching pistons. Any rods from ’58 and down should fit your pistons.
Before the later needle bearing rods, the bushings were known to wear out and would make for a noisy running motor. If the pins are still serviceable, new bushings can be made for the rods.
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