383 `68 Dart valve cover choices with ex.manifolds

A 1/16 steel spacer between the exhaust manifold (where the exhaust manifold gaskets goes) and the head as long as the outside of the manifold will still clear any other components?? Like the header flanges they make for home made headers.
Like this but thinner...although this might work?? Patriot Header Flange Kits H7890
pte-h7890_ml.jpg

treblig