When I first bought my Dart , I visited a web site that was a registry for 340 Swingers(1970 ) maintained by a guy called Joel Cooper.
This is some info he gave me:
Total of approx 13,800 cars made
Approx 10,400 made for export to USA
955 were 3 spd stick cars
4423 4 speeds
5000 automatics
Y05...