Locating sway-bar tabs

I have a 1970 340 Duster that I literally just had the same dilemma. I had the control arms off to box them, to cut off the factory sway bar brackets (purchased the Hotchkis 1.5"), and to weld on the new brackets. What I did was install the strut rod in the control arm (I used Hotchkis's adjustable ones) and aligned the bracket with the top edge of the arm, leaving the 1/8 gap. It worked perfectly. What you are trying to accomplish is to have the links vertical while sitting at ride height. That's why Hotchkis says to do it on the ground. Looking at your photos, I'm afraid you might be a little to far inboard. You won't know until you have the weight on the suspension. Nothing will look right until you get the car back in the tires, so don't try and mock up your front brackets until then. Also, Hotchkis says to weld the mounting brackets to the K-member but I was able to get 3 bolts in each bracket. One lined up with a hole from the OEM bar and I drilled the other 2. Worked great!