73 Duster question--Thanks

What is the factory engine and trans?
I used to have a 1973 Gold Duster foldown backseat 340 4 spd Gold with white top and white bucket and console interior. All original except 8 3/4 with 3.55s and sure grip.
Nice car till it suddenly had a foldown roof from an oaktree. Traded a rust 67 2 door post valiant with no drivetrain for it. Guy drove all the way from Oregon. Not an ounce of rust.
Here is 2 pics http://www.forabodiesonly.com/mopar/vbpicgallery.php?do=view&g=6577