Will I need new bolts or studs to install this?

Your existing manifold fasteners will work fine — reuse them when you seat the new gasket. If any bolts are damaged or stripped during removal, swap them out with OEM replacements matching your bolt spec.

Do I need to clean the mating surfaces before installing?

Yes. Wire brush or scrape away the old gasket material and carbon buildup from both the manifold and cylinder head surfaces until they're bare metal. A clean, flat surface is critical for a leak-free seal.

Can I reuse the header bolts, or do I need new ones?

You can reuse your bolts if they come out clean and undamaged. Torque them down evenly in a star pattern to your Ram's spec — check your service manual for the exact value. Over-tightening will crush the gasket; under-tightening will leak.