1. Doubtful
2. Probably. Like this: A340F -> Marlin 3.4 V6 adapter -> 79-85 Gear drive crawl box -> Marlin LC ToyBox adapter -> stock 80 Tcase.
I don't think there's a single adapter to bolt the 80 case to the V6 trans.
The only thing I don't know is if the 80 tcase will work with the ToyBox adapter like a FJ40/FJ60 case will.