Flywheel Bolts

I have known guys to re-use them with no ill effects, but they werent running race cars either. Personally I would just replace them. Cheap insurance and piece of mind. Whatever you decide to do use loctite.
 
I make it a point that all bolts used to hood rotating assemblies be new. Flywheel, clutch, driveshaft. It's cheap insurance against lauching a flywheel into your leg.
 
new arp flywheel bolts are $10

however, on my first 5.0, i've re used the same set of flywheel bolts for 2-3 clutch jobs over the course of ten years and never had an issue