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The cost for new nuts and studs is about $30 shipped, so it depends whether that feels like a lot of money.
The other thing to consider is that, if you use all new studs and nuts, you can be pretty sure that they'll all respond the same way – in other words, applying X ft-lbs of torque on the #1 nut will place exactly the same amount of compression on the head and head gasket as putting that torque on the #2 nut, the #10 nut, etc. If you're re-using studs that have been in the engine for decades, the consistency of the force will be decreased due to varying levels of metal fatigue, etc.