The editor of Hot Rod magazine is restoring a Chevy C10 pickup, and recently installed the rebuilt engine, when he ran into unexpected problems, which he describes in an interesting article in the attached link. In short, while repairing the carb, unbeknownst to him, a small check valve from the accel pump nozzle fell out & into the V8 engine. A valve & piston were destroyed, and the head suffered some nicks. No damage to the block.
His solution was to buy a new engine. This seems like an extraordinarily gonzo solution, given the engine damage was only to a few inexpensive parts that are relatively easy for a knowledgeable mechanic to replace. Or is there more to this, something that would justify installing another engine?