Proforged still has a 1-1/8" sector shaft fast ratio (longer) pitman arm and matching idler arm. Pictures and scuttlebutt indicate they are the same as sold by Hotchkis. These show the studs pointing down, so you'd need to use the 1973-76 center link. There will be fitment issues. For instance, Summit lists the pitman arm with all those that fit a '68 Barracuda but when click the "will it fit" button, you get a big red NO! And you're aware of the probable exhaust interference.
Yes, they work. You'll get 2, maybe 3° of additional positive caster. That'll make a noticeable difference in a street cruiser.