Do I need gaskets or seals when installing this header?

You'll want header gaskets at the mounting flanges — these are wear items and should be replaced with new ones during installation. They aren't included with the header itself.

Does this header require any prep work before bolting on?

Inspect the mounting surface on your engine block for debris or old gasket material and clean it off. The header itself is ready to install once you've confirmed all fastener holes align with your engine.

Will I need new bolts or fasteners to mount this?

Mounting hardware isn't included — you'll use your existing engine block fasteners if they're in good condition, or source new stainless steel bolts to match the original spec. Refer to your service manual for torque specs.