You can reuse them if there is no paint mark on them. But I would replace them with new ARP bolts. They are not expensive. Also, get the head cleaned and checked from machine shop for cracks and straightness. They can also check and recommend if it needs a valve job.
Timing chain is considered lifetime part and will last you easily 200k+ miles. You don't have to remove the head to replace the timing chain so it could be done later on if needed.
What made you think it may need a head gasket??
98 TJ 4.7 Stroker!!! Unichip tuner, D30/D44, 4.56, Detroit Locker in rear axle, 3.25RC SL, 1.25BL, 1MML, 33x12.50x15, Cager Softs 15x8, XRC10 winch, Rancho 9000XL shocks with wireless remote