If a glow plug broke off already wouldnt it damage the cylinder, valves, turbo as it makes it's way out of the engine?

Hmmm, if the car was "clean" or in nice shape what should I expect to pay for it?

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1986 190D, 2.5L, 5-speed swap, 180,000 Miles (60K by me).
Jeep CJ-7 with Cummins 4BT/NV4500/AtlastII 4.3.
Grand Wagoneer 4BT project in progress!