Not much original here. Looks like an A-1 frame from the gun pedestal, but V6 engine mounts. No “JEEP” embossing, and no welded battery “lid” on the cowl, so maybe a reproduction tub? 4 speed truck trans, but a Chevy bellhousing adapted to the Buick engine. D20 transfer case and a centered rear, but showing dust caps (2-piece axles?), and a D30 up front.
Wow, this is one fabricated CJ5!