74 power wagon dream truck...

Nice work on the truck.

I have a 73, replaced all of the suspension & did the chevy brake swap & everything.

Honestly, I didn't read every single page, maybe you have it covered.
Have you checked these out? I got them for my rig.
1st Gen Dodge Front Frame Shackle Hanger kit W150 W250 W350 Cummins Ram Ramcharger

I have no affiliation, not trying to sell them. I got them and they're pretty nice, kind of pricey, but if you're going this far on it... I couldn't find shackles/ bushings anywhere & found this guy. Thought I'd pass it on.

The only thing to look out for is the top bushing bolt is aimed right at the header collector.
(I have old hedmans) Had to "dimple" the collector so it didnt touch. Also put the bolt in from the outside in case I need to get it out later without dropping the header.