If you read through the workshop manual, you will not find any recomendation to replace either the rod bolts, or head bolts during a standard overhaul, unless they are faulty, damaged, or outside service limits in some way.

Millions of engines have been rebuilt with used rod & head bolts during the last hundred years or so without a single problem, including all of my Datsun rebuilds.

If you are building a 'balls to the wall' race engine, then high quality, high strength fasteners are a good investment, but there are plenty of winning engines still running perfectly good recycled fasteners without tragedy striking them down. If they aint cracked, stripped, or stretched beyond limits, then they still work fine in normal service.

In a stocker, even a GX stocker, you will be fine too.