How many of these 65 darts were made??

It makes good sense that the car is unusual in that the 270 Darts were the High Trim model - extra chrome, stainless trim, nicer seat covers/ dash. It was targeted to families looking for a little step up in style - not a performance offering like the Dart GT. Ordering this particular model with that engine would have probably been a special order by a very specific, very car conscious buyer...