W J,
That question just might get me to start jumping out of airplanes
Never saw a 273/235 Commando in a 65/66 Valiant convertible. Though I would imagine some were produced.
An old high-school friend of mine had a 65' Dart GT (white w/black convertible top (with the plastic rear window, that would yellow due to
sun exposure) with a 273/235 Commando. An automatic on the column.
Not sure of the interior color. But, it came with a non-posi rear. I do remember the one-wheel spins.
The car still sits in a garage in Jefferson Valley, NY.
The 8 3/4" Sure-Grip was not available until 1966.
OLDRIDE.com may have info on the convertible Valiants.
Paul (Pull the Rip-Cord)