Speaking on the sliders, I read a post here about them in conjunction with switching from the 74 plus to an earlier bumper which was a little confusing, but I've since figured it out.
You made the sliders or purchased them. I see some info about Calvert but the don't seem to have anything specific to Mopar A bodies. Car Tool seems to have them though. I'm not adverse to trying anything, so all
this is about ingenuity as well as having something to do. I haven't heard any comments about the half pipe offset shackleI pictured. It was made by a Chevy guy, but I don't see why it wouldn't work. That and a homemade front bracket would put me in business.