Rebuilding Some AKM

So yesterday the armory i work at receive 4 broken Polish AKM with pretty burned out bolt and a basically rifle-free barrel (they were training rifle so they been fires for literally 50 years now). My commanding officer said those guns was free game and i can do whatever i want with them in the shop. I don't know if i should rechamber them or just replace it with a new AKM bolt and barrel. Got some AK74 bolt/barrel and Galil bolt/M16 barrel laying around. What should i do ?
Should i rebuilt into 5.45x39mm,556x45mm or keep it 762x39mm.
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