Under dash unit will fit just fine, just don't like the look, you know it was an after thought. I am thinking about trying to tuck this up in the cowl, then making new front duct section. It is vacuum based servos Have to move the ugly controls.
You may remember that I struggled with this same thing. If you are willing to cutout that area it is doable. You can even use their micro switches on the existing slide controls. In the end I decided that the under dash just made more sense. Besides, the look IS period correct albeit an after thought.
Kent I get it, not saying its bad just sayin' it ain't pretty For me, I might cut, I might cut the AC unit voiding any warranty that might have been implied. Who knows I might change my mind More than likely what ever I do it will be done three times over for the sheer hell of it. And I am sure lots of welding will be involved.