340 Exhaust Manifold Hardware Question?

Hello,
My 71 Challenger has long tube headers. I will be switching back to original factory exhaust manifolds in the near future. My question is, do I need any special hardware (bolts/spacers etc.) to correctly install the factory manifolds? I know I will need gaskets. If so, what hardware do I need and where can I purchase it? The car has a 340 with an automatic transmission. Also, does the service manual have a torque spec. for the exhaust manifold bolts?

Thank you...

340 Exhaust Manifold Hardware Question?