Dart "Lite" aluminum intake
The Feather Duster/Dart Lite got a 1-piece sandcast aluminum
1bbl intake manifold. Nice quality casting. Direct swap for any other slant-6 1bbl intake; I've got one on
my '73. This is similar but not quite the same as the '83-'87 1-piece sandcast aluminum 1bbl intake, and it is
definitely not the same intake as the '78-'82 2-piece EB-welded 1bbl and 2bbl aluminum intakes that weigh almost nothing.
There's nothing magical about the particular Holley 1945 carburetor used on the FD/DL. It's got a smaller venturi and smaller throttle bore and lean calibration -- conceptually the same as the taxi/fleet carburetors offered since '62.