I have an 84 here in my yard. It was born with a 360/727/ 8.25
I pulled all that out, when the engine started burning too much oil. I swapped in a 318 4bbl/ 904/2800 stall and an 8.75 so we could fool around with gears.
I still have that original powertrain. Not sure but I don't think I still have the driveshaft. You interested?