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Just went through this with my 81sc. Short answer is it needs to be fixed, or you risk damaging the engine. To fix it the engine needs to come out, the heads are pulled, all the studs are replaced.
Of course while its apart any reputable mechanic will recommend a valve job and reseal. Also might as well replace the clutch disc plate and throw out.
You will also find other problems like worn cv boots, mounts, crumbling sound inslulation pads, worn hoses etc.
I feel as though I resisted 'while your in there' syndrome as much as possible and ended up spending $5000+
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