I’m not an expert but I believe that complicates things since you appear to have 73-76 lcas with the tabs in place for the 73-76 bars as well as front mount calipers.
Just pointing out an option. Hellwig doesn’t have a bar that uses the later LCA tabs, but Hotchkis does. Yours and the other comment sounded like you didn’t think there was an option at all.
I think the Hotchkis is the only one that will bolt up to the 73-76 LCA's on a 67-72 K frame.
Looking at where the Hellwig 55917 mounts, it appears that it put the end links outside the strut rod mounts still. The 73-76 sway bar tabs are on the inside of the strut rods, so the #55917 probably wouldn't work with the factory 73-76 tabs.