Did they ever produce a slant 6 4 speed with a console in 1966?

toolmanmike said
Dodge Dart, GT (premium)

Nope. Refer to the '66 Canadian FPC model ID pages posted earlier.

appears to be a American Dart and not a Canadian Valiant.

Nope. Darts weren't sold in Canada in '66, and Canadian-built Mopars weren't sold in the States in '66.