Hello 81nomad, and welcome to the site!
Food for thought. Detroit in the front is pretty hardcore, but the Dana 60 is 8 lug like your G30. Good hunting!https://roswell.craigslist.org/cto/d/1984-chevy-k30-m1008/6360844597.html
This is the ideal one ton crawler setup. Dana 60 for the front, Drivers side drop, already geared 4.56, plus detroit lockers front and rear. You'll still need the NP205 transfer case, plus driveshafts. Etc. Lots of other goodies listed.
Very likely the same axles used on Big Red.