A-Body torque boxes?

Couple quick question on A-Body torque boxes...
I have a couple 340 Swingers - a '70 4 speed version and a '72 automatic (cdn) - the 4 speed car has front boxes and none in the back. My '72 automatic has boxes on all 4 corners which I understand/hear is not something you find everyday (the '72 340 Swinger Specials are as well i guess). Here's my question/query: is there any automatic Swingers out there with torque boxes or is mine an odd find. Also, I know most '70 Dart Swinger 340's got torque boxes - at least 2, if not 4 on each corner - but did 340 Dusters and Demons get boxes? Also, how about '68 and '69 340 Darts? I haven't owned any of them and I guess I never crawled under one to check either, so let me know.