Heat Shield Placement?

I had exhaust leaks on my 273 4bbl engine, so I removed the exhaust manifolds to sandblast, repaint them and replace the gaskets. I have the original heat shield on the drivers side. I'm ready to re-assemble. On which side of the gasket should the heat shield be placed? On the head, or on the manifold? I don't want to repeat the exhaust leak problem.

FYI. For anyone removing the drivers side exhaust manifold, the only way I could get it out was to disconnect the brake line from the master cylinder on the power booster.