Quick question about axles n' hubs and 3/4 ton stuff

[munice]

Hey guys and gals, I'm looking at picking up a 78 GMC K20 (for my axle swapping project..) it has a 14bolt FF rear and Dana 44 front, im not sure though if this would still be a full time 4wd truck or not? I have a notion to think that 79 was when they stopped using NP203s but im not sure.. Is it true that one can just put locking hubs on an axle that came out of a fulltime system? (going into my truck with a part time setup) Ive scanned the forum about this too...(todd this is what happened to the frankentruck right?) The other thing I heard was that Dana 44s use the same locking hubs as the GM 10 bolts (which would be great cause i could rob them out of my stock front axle)