lightest a-body??

Plymouth Valiant: http://en.wikipedia.org/wiki/Plymouth_Valiant

'61-'62 106.5" wheelbase curb weight 2750#
'63-'66 106" wheelbase curb weight 2692#
'67-'73 108" wheelbase curb weight 2743#
'74-'76 111" wheelbase curb weight 2819 #

Adding 2" to a cars wheelbase makes it heavier not lighter.

Equally equipped, the Gen II W/the shortest wheelbase should be the lightest as evidenced by the above

The "A" Body Dart started out @ 111" so it's not even in the running.

The "A" Body Lancer would be the same as the '61'62 Valiant.

So shoot me I was off by 50lbs. that is only 1-2 options different away from being lighter.