Those look like older "external locking/full time hub" front hubs (~'71-'72 Chevy and ~'71-'75ish on GMC's) versus the later "internal locking hub" hub. Also, the flat top knuckle on the passenger side ended in ~'75 or 76 on GM truck front axles.
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Jack
I think I found the correct Warn hub for my swap
Warn Premium external style (big hub style) locking hubs, for '67-77 3/4 ton GM trucks. part # 9072
Wow wow wow. I have always dreamed of building a pop-up for a full vert like mine, or seeing if one of the still in business companies could do it.
Your's is ridiculously good. It's unreal. Love and cherish it, they are becoming impossible to find in that condition (as I'm sure you know).