It has been a few years since this story occurred... but I used to have the local dealership service manager bring me FJ60s to do emissions, carb and tuning work on. Rigs that the dealer's customers had brought in to him. When I asked him WTF was going on, he stated; "Most of my techs were not even born when the last Toyota carburetor came off the assembly line.
We won't even get started on the likelihood of getting a dealership to do an engine, trasmission or differential rebuild. That just is not what they do nor what they want to do with their time. That is not how the "techs" want to spend their time and not how management wants them too either. So... do you really want YOUR rig in their care (in their hair so far as they are concerned).
My point... Your dealership "techs" are NOT the place to turn for knowledge, expertise and especially experience working on any '80 series. And the dealership higher ups would just as soon you did not even show up with it for the most part.
Mark...