sadly I tossed the liner in my 86
it was my dd & I was single at the time, so the noise was a non issue...
However, in the summer, the heat was horrible!! I'm 6'2" so I didn't have a lot of space. Whenever I first got into it it would just scorch my brain pan...
the a/c didn't come out the vents properly so that didn't help. I later learned the plenum had a hole in it so the cold air just cooled the floor.
I drove the 90 all last summer without a/c, it was much more bearable with the headliner.
However, the 90 has a tailgate vs the barn doors in the 86. Having the tailgate window down helps immensely

in fact fixing the a/c has dropped off the priority list for it...
so, in summary: it's bearable with a tailgate, don't even think about it with barn doors...