76 Scamp A/C

As Redfish mentioned in his post, the reed valves are the most fragile part of these compressors. The rings and cylinder bores are likely okay. The FSM will tell you about cleaning up the bores if need be. Yes, these compressors are very much like small engines.

On the seized compressor in that 65 Fury, if it's locked up, it's very likely scrap metal and not worth anything in terms of parts. They usually lock up like that if they run out of oil. At that point everything inside is pretty much destroyed.