The 77 400 & the 80 301 T A/C systems were similar but different.
The Turbo motors used the shorter 80's style compressor & the 77 used the traditional longer 60's & 70's style.
If you can get EVERYTHING outboard of the evap housing from the 77,you SHOULD be able to make a functional system for your 81 with 400 eng.
You MAY need to change out your evaporator due to fitting/line differences,so make sure you get EVERYTHING A/C related off the 77 parts car,including condensor.
Have FUN!
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