I have a 77 trailduster that I have had for almost 22years now. It sat for 13 years went from 97 tabs to 2010 tabs. about a year ago I bought a 84 or 85 RC for a parts truck. swapped axle's transfer case and trans. it's still the 3 speed tranny is there a newer trans that will bolt to my original 360 and the 208 transfer case. I have seen the over drive units that bolt on to the rear of the transfer case but $3000 is way out of budget
I'm not sure of all the swaps you can do. I am in the middle of putting an A518 (overdrive)/241 transfer case from a 90-91 truck into my 79 Ramcharger with a 360 to replace the 727/203 transfer case. There are some modification that have to be made but it will work. Ford and Chevy guys have been doing this swap for years. Do an online search for what will work for you. There's plenty of information out there.
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