Easy fix, 4WD front axle [with greasable u-joints], gear to gear NP20? transfer case, little driveshaft build, torch a hole for the 4WD shifter, boot it in nice and have fun, my granny had one of these, 1970 Chev/GMC, blue and white, 427 or 454, cant remember, dont these have dual fuel tanks too? grannys did.
Manual lock in/out hubs and Lockright Lockers front and rear.
Lock Right in the front of one of those 4wd would be a bear, limited slip would be better. Detroit in the rear all the way, those are a drop in for the 14 bolt rear as long as its an open carrier. Basically indestructible.
They may have refined the Lock Rights in the last 20 years but I tore up two in a 12 bolt and gave up. Had one in the 44 in the front of my Jeep but that was basically a crawler.
