If forged pistons then it might have full floating pins then it could be a snap ring got loose or probably wasn't secured in the first place.
Press fit pins don't move but it is *possible* that is was pressed in the wrong distance but had just enough to allow assembly. The rod side clearance allowed it to rub. I say "pressed in" but in reality you heat the rod end and then quickly set the rod in place and slip the pin through. Once it cools it shrinks on there. A fixture is typically used so the pin ends up where it is supposed to.
It possibly could be sleeved if the block is important. Some of those early 60's blocks were pretty generous with iron and have thick walls. Some of the early 283's would take a .125 overbore and you could build yourself a 301.
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