The Yard Dart, a Reclamation. '64 Dart GT Ragtop

I dug into this beast and have found a serious problem. It has dropped the exhaust seat on number eight. Piston destroyed, head damaged but (I would assume) quite repairable. I will get the head to a local machine shop to get their input. You guys tell me what the usual approach is for the dropped seat issue that I've read was common on the early G3s. If I'm correct that the failed seat area can be repaired, what is usually done to address the rest of the seats? Is the problem usually isolated to one cylinder?
Meanwhile, the bottom end is perfect and the oil changes were frequent, as it's all clean as a pin. The cylinder received two marks that are visible, but I can't feel them at all. No bore required.
Depending on what I learn re: the seat repair, I may proceed with everything stock. I *could* be tempted, though, by things like 426 stroker kits...

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