I do not think the jack the weiner dog sold you is an A body jack. All the '67- '71 Valiant/Dart/Duster/Barracuda jacks I have seen are tube type masts.
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph