[JLMounce]

I think if it's just one leaf out of the pack, and especially one of the middle leafs, I'd certainly see if it can be salved. That may be the best case.

It is somewhat common. When I replaced the rear end in my 69, both leaf packs were split in half completely once I loosened the U-Bolts. The design traps moisture in that area and they corrode over time.

If you have no intention on having the car judged and are not looking for maximum value at auction of the like, I would probably check into sourcing the correct springs from Eaton. Unless there's a decent shop or two that does leafs in your area (There might be considering you're in Indianapolis) you might be both money and time ahead getting a new set of leafs.

If they sit a little high which is the most likely outcome, you can use a lowering block to get where you need to be.