Thanks Racer-x. That does seem the simplest solution if I want to stay in the EA71 4wd game. Definitely a classic.
I am surprised, however, from a mass production standpoint that the wagon body style seemingly the same on the 2wd and 4wd that you can't just switch the 4wd stuff over. A quick glance at the under carriage it looks pretty similiar but apparently not. And I was going to a complete rebuild on everything anyway so it wouldn't be that much more work. That is, new boots on the axels, new struts, etc.
And yes, my 79 (production date 12/78) does have a stock electronic pointless distributor.
Thanks for the input. Joe