If I still had the donor vehicle? Keep it a 144ci 4cyl, but… flathead.
Leaf springs f/r with offset pinion live axles, with adapted VW Bus portal ends. Baby Unimog? Transmission and transfer case out of the donor, custom driveshafts to accomodate the extra 28” of wheelbase vs the donor?
Said donor being my 1946 CJ2A…