There was a place selling repro side Dart glass from Brazil. Brazil ran Darts with the same windows up to the 80's I think. Troy bought some for a great deal and they are thinner than stock. Cheap thinner repro glass = perfect! About halfway between Corning glass and factory glass!!
There's some FABO members here from Brazil. You might want to contact them.
Corning glass is not very practical. To take it that far, you better super detailed on EVERYTHING else
There doesn't seem to be a real SS car that is restored with extreme high detail that people are doing nowadays and reflecting the knowledge that is out there currently.