I just put a stumpy in a 1984 110 a few weeks ago and the tunnel and floors are out (came to me that way). I did a trial fit drop down the floors and tunnel and while it is pretty tight, everything cleared the sheet metal.
The shifter arm and knob are different, but the LT77 ones fit the R380 although the knob is different.
On some of the LT77 setups, the transfer case shift linkage is different, but one from a disco worked fine in the one I did.
Uncle "Richard" Douglas has a Land Rover with big wheels that never gets stuck... until he breaks something so it won't go. Uncle Douglas always breaks something. - Anna Crowther at the Conclave 2012 (AKA Carburetor Neck)