This blurb is from a Mecum auction but sounds plausible.
"Dodge’s normally-aspirated, high performance 273 was rated at 235hp. The extra 40hp the D/Dart produced was basic hotrodding. Off the shelf speed shop bolt-ons included Racer Brown valve springs, a Camcraft 284-degree .500″ lift cam, Doug’s Headers, and a Holley 4160 bolted to the stock intake. All were equipped with the A-833 4 Speed and a Hurst shifter, Weber clutch components, and an 8 3/4 Suregrip with 4.86 gears. Unavailable for this car were air conditioning and a warranty. There were no external badging or markings to note the D/Dart package over a regular Dart GT."
Seems the one big difference between the general D/Dart description above and the Ron Root car from the magazine in the first post is the dual quad intake.
