Do I need new fasteners or studs to install these gaskets?

The gaskets themselves are standalone — fastener condition depends on your existing header bolts or studs. If they're original and high-mileage, replacing them during gasket installation prevents future leaks.

Can I reuse the old gaskets or do I need to replace them?

Header gaskets are single-use. Once torqued down and heated, they compress and lose sealing ability. Always install fresh gaskets when the header comes off.

Will I need to do any surface prep on the header or manifold mating surfaces?

Clean both surfaces thoroughly with a gasket scraper or wire brush to remove all old gasket material and carbon. A clean, flat surface ensures the new gasket seats properly and holds compression.