Transmission Tansfercase Questions

[82 Silverado 4X]

This much I do know. I have an 82 Chevy 1/2 ton 4x4 with the NP208 transfer case and auto hubs. The transmission in my truck is a manual with granny low gear (465 right?).
I have what has been identified as a 1980 NP205 with the slip yoke rear output that's mated to a 465 manual transmission that's been laying out in my garage for over 5 years.
I would like to install the NP205 in my 82. The front driveshaft output plates are the same on both. The 208 has the similar design slip yoke rear driveshaft output like the one on the 205. The only obvious difference is the overall length of the transfercases and the adapters. The 208 with adapter is approx. 6-8 inches longer than the 205 with adapter. This I know would mean lengthening the rear driveshaft to make up the difference.
Am I missing something else or would this be a relatively simple changeover? Anyone done it?
If this can be done, my next move would be changing out the 1/2 ton axles and springs for some 3/4 or 1 tons.

Thanks for any and all input on this one.