The old bolts should have been fine. They're not torque to yield fasteners so unless there is pitting or they don't measure at the same length you should be all set... That having been said, I don't like to rely on any fastener that old; Especially if the engine's over heated at any point.
Studs offer a higher clamping force and more consistent torque readings with less possibility of striction.... Plus if they're dumbasses and didn't chase the threads in the block (which can REALLY screw up torque readings causing you to torque FAR below your target) you will still achieve a close enough level of torque to not worry. Unless you're having the block and head milled you need to stick with the stock HG. The head should have been milled the last time so a good cleaning and lapping of both head and block are really all that should be needed as long as there's no warpage to either.
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