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thats a good question. i'm pretty certain the general advice is to get new bolts when heads are removed, as the stock ones tend to be stretched a little.
a good & popular upgrade is ARP head bolts.
GM introduced a new kind of head bolt. Is it called Torque to Yield? I don't think your engine has those though.
Anyway, those TTYs should be replaced each time they are removed. If yours are regular/normal type head bolts, they can be cleaned, re-lubed and used again as long as they're in good condition.