Galen Govier's "Chrysler Corporation Production Option Code Book", shows a total of 764 Dart 270's with the 273 4bbl.
218 273 4bbl 4 Speed cars.
546 273 4bbl Automatic cars.
The production numbers are for both the Dart 270 2 Door Hardtop and 4 Door Sedan, there is no break down for the two models.
I own one of the 218 273 4bbl 4 Speed cars. I ordered the car new, the way I wanted it and still own it.
Herb