Hi,
Ask around to see if you can find a trustworthy local shop. If so, they can look at it and tell you if it's rebuildable or not.
The originals might be better made or better materials than reproductions. I don't know that for a fact, but it seems to be true of many replacement parts.
When rebuilding (or recoring) an older rad, you may have some opportunity to upgrade. For example, it's a great time to install brackets to mount an electric fan and/or shroud, and some shops might be able to install a higher performance core.
The only downside is weight. A modern aluminum replacement cuts almost half the weight off the originals.
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